A Wing In Each World

For All Souls Day,  friend and colleague Eddi – the original Culture Vulture on the Inglorious Bustards team – reflects on a recent trip to experience the awe-inspiring Griffon Vulture migration, and gain understanding of their liminal nature in local lore…

The Strait of Gibraltar last Saturday morning was calm, suspended between us and Morocco. A calm day perfect for the Griffon Vulture migration, but the skies were empty. Then, like some blessing from birders’ heaven, we found ourselves in the flight path of up to three thousand Vultures. Catching the thermals, they spiralled up before soaring across the 14km Strait. This is the diciest moment of their migration to the Sahel and our adrenaline rocketed when their column fell closer to us. Suddenly these immense birds soared metres from our heads. Claws, feathers, bone, a glinting eye were almost within touch. 

A young Griffon Vulture eyes up the continent of Africa! © Inglorious Bustards

Vultures have been loathed and detested throughout most of western history, written off as nature’s ghastly gourmet feasting on carrion. Charles Darwin called them “disgusting birds that wallow in putridity”. Long associated with death, battles and rotting meat, in our cultural imagination the Vulture is earthly and gothic, belonging to the nether worlds and giving “material form to the idea of a dark angel.” Swooping over the body of a loved one, it is easy to see how much this awesome bird would look like death itself. 

As we stood under their thermal on Saturday we could see their bulkiness, their physicality. Over 2,000 birds weighing up to 11kg each is literally tonnes of flesh in the sky. 

Yet for all their earthiness, in the air they are in their element. Transgressive, the Griffon Vulture lives between heaven and earth, building their nests in the highest rocks and crossing continents while still young. Both Christianity and Ancient Greek cultures have figured them as messengers between humans and gods. The Greeks saw them as “from some foreign and unknown land”, often flocking to and predicting the site of battle. In Christianity Vultures were bad omens appearing at sites of destruction “where the slain are, there the Vulture is.” (Job 39:30) But it was the ancient Egyptians who recognised their liminal state and deified them. 

Griffon Vultures rising on the thermals to cross The Straits © Inglorious Bustards

In Ancient Egypt Vultures were valued for their abilities as carrion eaters. In such a hot climate, where dead flesh rots very quickly the bird was important for the health of the people. So much so that one Pharaoh decreed the death penalty for anyone who killed a Vulture, making them the first ever protected species. But this ability to clean the world of stench and rottenness came with taboo. While grateful to the Vulture for ridding them of contamination, it is likely people feared and detested them for touching the same object. The Ancient Egyptians reconciled this conflict in the mother goddess Nekhbet. 

The goddess Nekhbet was the protective deity of southern Egypt and often took on Vulture form. In paintings and engravings from 3,200 BC we find her hovering watchfully over the heads of kings or, with her wings spread wide, over queens giving birth. She gave protection to royals as seen by the ornate Vultures headdresses they wore. But the mother goddess as Vulture had a very strange role in the culture’s mythology and religion. As “Terrible Mother” she offered both shelter and protection but at the same time the death-bringing, corpse-devouring goddess of death. The Ancient Egyptians saw Life/Death as two sides of the same coin and Nekhbet perfectly captures the dual role of Vultures in her associations with female, life-giving energy and death. 

But isn’t this all a long way from Andalucía? Well, two things suggest it might not be that far: Vulture culture and rock-tombs. The Egyptian influence on Spain and Portugal can be seen at the mysterious rock cut tombs at the Sanctuary of Panóias in northern Portugal. This is a largely forgotten temple to Serápis, the Graeco-Egyptian god of the underworld and resurrection. Latin inscriptions next to the sarcophagi shaped tombs read 

“To the Gods and Goddesses of this sacred place. The victims sacrifice themselves, and are killed in this place. The viscera are burned in the square cavities in front. Blood is poured here to the side for the small cavities. It was established by Gaius C. Calpurnius Rufinus, a member of the senatorial order”

The sacrifices made by the cult to Serápis at Panóias were symbols of rebirth, acknowledging the dual role Life/Death. Hundreds of rock-carved tombs, similar to those at Panóias, litter the hills of the Cádiz province. These enigmatic sites are attractive precisely because they are so mysterious. Lacking in inscriptions, we know little about their function or origins. These empty sarcophagi lie open to the sky, filled with rainwater and decades of archaeological frustration. Often they have panoramic views of the mountains or oceans, are near a spring or water source and, most crucially, near vulture colonies. 

The rock tombs of Betis, for example, are only 14km from the Straits and just beneath a limestone outcrop called Cerro de Bartolo. Some of the young vultures migrating over the Straits would have nested at this colony. Prime position overlooking these rock-tombs. Many of us would recoil at the idea of sky burial and early Christians saw it as the ultimate punishment. But there are those who revel in the idea. When in his poem Vulture Robinson Jeffers plays dead on a hillside, I imagine him lying down in one of these graves – 

“To be eaten by that beak
and become part of him, to share those wings and those eyes–
What a sublime end of one’s body, what an enskyment; what a life
after death”

Perhaps Vultures are the key to understanding these mysterious tombs in the sierras of Cádiz. The proximity of these rock tombs to the Griffon Vulture colonies point towards their use as places of symbolic ritual, an “enskyment” transmuting earthly bodies to air, reconciling birth and death in rebirth. 

A young Griffon Vulture drifts right over our heads before it continues its pilgrimage to The Sahel © Inglorious Bustards

While Vultures no longer has god-status, we are rediscovering that which our ancestors clearly knew and awarding them ‘keystone species’ status. They cut down disease transmission and act as carcass recyclers. Protecting Vultures means protection of the entire European mountain ecosystems. Vultures offer us the key to examining age-old human questions of life, death and regeneration. Perhaps this goes some way to explaining the awe we felt watching their migration over The Straits. We were witnessing an event older than the rock tombs, more ancient than Nekhbet and the Egyptian gods, something that continues to pierce us right to our core. 

Eddi Pitcher is author of Wild Guide Portugal and lives in Cádiz, researching her new book, Wild Guide Andalucía and leading cultural tours in Spain and Portugal.  We are very honoured to have her on board!  Contact us about enriching your bespoke wildlife trip with some fascinating local cultural and historical highlights with Eddi!

Saying “Később találkozunk!” to the Honey Buzzards!

This week, along with our friends and conservation partners at Fundación Migres, we counted just a handful of European Honey Buzzards crossing The Straits of Gibraltar on their migratory journey.  Picked out from amongst thousands of Booted and Short-toed Eagles, Eurasian Sparrowhawks, Black Storks and Griffon Vultures, each one of these gorgeous birds merited close attention to their detailed and variable plumage.  Not least because at this point of the year, we never know which one will be the last we’ll see until Spring!

Adult female (old?) European Honey Buzzard eyes up Africa © Inglorious Bustards

“Honey Season” is definitely drawing to a close and these numbers are very different to those we observed during the peak in late August / early September, when we counted over 47,000 birds crossing in just one week!

These tail-enders are the last few of the 85,000 or so that will have passed through here this autumn.  This is more than the breeding population of western Europe, so it’s clear that something interesting is going on!

Spring counts of birds heading north across The Straits yield far smaller numbers – typically around 15-17,000.

Ornithologists have speculated for some time about the reason for the discrepancy in numbers.  It seems – as you might imagine – that the populations that breed in north and western Europe migrate back and forth along the route that brings them through here.  However in autumn, their numbers are augmented by their eastern cousins.

Research published in 2019 used satellite telemetry to follow a single adult male European Honey Buzzard, tagged in Hungary, over three years of its life.  It supports the theory that many of these eastern birds follow an incredible anti-clockwise loop migration, spanning vast areas of Europe, to travel between their breeding and wintering grounds.

Autumn (yellow) and Spring (red) migration routes from; Repeated large scale loop migrations of an adult European Honey Buzzard. N Agostini et al, 2019

Once the breeding season is done for another year, the priority for these nomads is understandably getting to their wintering grounds as safely as possible.  Heading to Africa via The Straits of Gibraltar is definitely the long way round, adding over 2,300 km to the trip compared to a direct route.  Each autumn, the male in the study (let’s call him István!) covered an astounding 7,046km from Hungary to his favoured wintering site in North Cameroon in around 43 days.

The study also measured how much the bird was compensating for crosswinds – in other words, actively choosing his route.  It revealed he worked extremely hard to stay en route to The Straits, only drifting passively for about 10% of his journey across Europe.

The advantage of this mammoth detour is to allow István to avoid the risks associated with trying to cover many miles of thermal-less water crossing the Central Mediterranean.  Our 14 km sea crossing at Tarifa is nothing to these bad-ass flyers!  Their compact structure, intermediate between harriers (Circus spp) and true buzzards (Buteo spp) lends itself to powered flying and leaves them somewhat less reliant on thermals than longer-winged raptors.  It’s no wonder that we see them crossing in seemingly treacherous conditions, powering out across The Straits in large groups while longer-winged birds like Short-toed Eagles cling nervously to the coastal hills!

juvenile European Honey Buzzard © Inglorious Bustards

Once safely over the sea and into Africa, István spent relatively little effort compensating for wind direction while crossing The Sahara, spending over half the crossing simply drifting effortlessly over this perilous wasteland.  Thanks to this and other studies, we are starting to understand that these incredible birds plan their routes not only to avoid threats but also to connect with anticipated weather conditions, such as helpful prevailing winds. Totally amazing!

István took his time on his way south to his African R&R spot. Of those 43 days, 12 of them were spent on chill-out stops!  Spring however, is a different matter altogether.  Speed is everything, and the race is on to return home as fast as possible and secure the most optimal breeding site.

This leads István and many like him to make a beeline (sorry!) for the breeding grounds, foregoing the relative safety of The Straits of Gibraltar and taking their chances on longer sea crossings.  He flew all the way back to Hungary in just 23 days, resting for only six and slicing almost 1,500 km off his journey, crossing the Mediterranean via Tunisia’s Cap Bon Peninsula, Sicily, Italy and Albania.

Meanwhile here in The Straits, we would have been seeing almost exclusively those birds heading to north and west Europe – including France, the Netherlands, and even the UK.

For young birds though, the picture is very different.  These risk-averse autumn routes are learned in later life, by following experienced adult birds.  In its first year, a Honey Buzzard is effectively abandoned by its parents, which leave the breeding grounds on average 1-2 weeks earlier.  It can only follow its innate sense of direction, which leads it SSW, to launch itself at whatever water body or desert it finds in its way!  Only the strong – and lucky – survive.  One in three young Honey Buzzards will die on their first migration while crossing the Sahara.  The area of Africa where they end up wintering – and to which they will eventually become site-faithful – is largely determined by winds and chance.

Adult male European Honey Buzzard © Inglorious Bustards

After such a large investment in rearing the young Honey, this seems like some pretty harsh parental treatment!  However, as always, everything makes sense in the light of evolution.  Every day adults delay their own journey, and every day they would lose en route accompanying slower, less-skilled juveniles decreases their own survival chances.  This more supportive parental behaviour would soon fail as a strategy.  Evolution has moulded  this behaviour – effectively sacrificing one in three young birds who will die on migration without guidance – to ensure that the successful adult optimises its chance of survival and lives to breed another season.

This absentee parenting strategy has certainly worked for István!  He was first tagged as an adult in 2014, and is still going strong.  On 7 September this year – amongst 9,499 other individuals – we observed a tagged bird crossing The Straits, who we subsequently learned had travelled to us from Hungary!  I hope it was István, and I’ll be thinking of him and his epic journey ahead.

Icons of Migration – How White Storks Have Inspired the Study of Migration for Centuries

Even in a place so packed full of natural migratory wonder as The Straits of Gibraltar, there are few sights as wow-inducing as a flock of hundreds – if not thousands – of migrating White Storks.  As they move along the coast in huge, glittering black and white columns, tracing the patterns of the thermals they ride, they really are the epitome of visible migration!

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White Storks heading to Africa – July 2020 © Inglorious Bustards

These flamboyant voyagers capture the imagination and curiosity, and have been inspiring research into migration for hundreds of years.  Back in 1822, a White Stork turned up in the German village of Klütz with what was clearly an exotic spear lodged through its neck.  It turned out to be from central Africa.  At a time when it was still commonly believed that Barn Swallows spent the winter hibernating in the bottom of muddy ponds, this Pfeilstorch – ‘Arrow Stork’ – opened our eyes to the possibility of incredible avian journeys, and migration science was born!

Their great size, conspicuous presence and predictable return to nest sites makes White Storks fantastic candidates for study, and extensive ringing (banding) programmes were already underway as early as 1906.  From then until the onset of the Second World War, about 100,000 mainly juvenile birds were ringed, resulting in over 2,000 long-distance recoveries of birds reported between 1908 and 1954.  To this day, this wealth of information is arguably the foundation of what we know about where they travel and the routes they take.

White Storks breed extensively across Europe.  Almost like a watershed, there is a line that runs right through the middle of Germany, along which the westward-flyers separate from the eastward-flyers.  The eastern route leads over the Balkans, the Gulf of Iskenderun, the countries of the Middle East over to East, Central and South Africa.  The White Storks we see here, crossing over The Straits in such spectacular fashion have come from west of that line, their migration leading them down through France and the Iberian Peninsula to concentrate at this point.

For a bird with such a large wing span, flapping flight uses around 23 times more energy than gliding.  Since there are no thermals over the sea, they are driven to seek out the very shortest distance between land masses.  That means that, in an average autumn season, 150,000 White Storks of all ages – pretty much the entire western European population – are pushed towards this one point, looking for their moment to cross the 14 km (9 miles) of sea to Africa.  This gives rise to the spectacle of these huge gatherings, spiralling upwards on rising warm air until they emerge up to 1500 m above the ground and then gliding out into the blue.

From here they continue their journey south into Morocco, across the Sahara and down to their wintering grounds in central Africa.  In fact, having cheered them on in The Straits, we often get to see them again when we travel to The Gambia each December!

In the 90’s came satellite-tagging technology, a new way of gathering information about birds that was set to change the way we understand so many things.  Technology tends to be larger when new and unrefined – some of the earliest tags were the size of a brick!  Since a tag is required to be below 3% of a bird’s bodyweight to avoid hindering it, these gigantic nomads with their fascinating journeys presented the ideal species to take this new toy out for a spin!

This opened up the opportunity to study a whole new world of detail not just about migratory routes, but about migratory behaviour.  White Storks usually migrate in mixed groups of both adults and younger birds.  A number of studies have followed the fortunes of young Storks making their first migration without adults to follow, in order to look at the innate-ness – or not – of the journey plan.

Although their in-born sense of direction takes them vaguely in a south-westerly direction, if displaced by weather conditions they are unable to orientate themselves with any precision and many never fully migrate.  This is very different to small passerines, which migrate more-or-less alone, often by night, following an inherited map and with no guidance from adults.

The high importance of this social inheritance makes a great deal of sense.  As a day-flying, soaring bird, the efficiency of their route is heavily reliant on thermals generated by local topography.  They follow adults to learn an exact route – a kind of thermal highway – which on future travels they will be able to recognise visually and be sure of the optimum journey.

Tags also give us more information on the temporal nature of migration in these birds.  It turns out they treat it rather like a nine-to-five, flying for around 8-10 hours every day when the air is warmest, before resting until the following morning.  They barely take a day off, covering the 4,000 km (2,700 mile) journey from northern breeding grounds to sub-saharan Africa in two to three weeks.  Rather than feeding up before migration like some birds, Storks evidently snack en route only to meet their immediate needs, and lose weight on the journey.  Presumably when you’re reliant on literally being lighter than air, every invertebrate over-indulgence counts!

As satellite tags become lighter, cheaper and more precise, the insights they give us become ever-more fascinating.  In 2018 a project set out to explore how White Storks navigate thermals as a group by analysing individual high-resolution GPS trajectories of individual Storks during circling events.

A thermal is a complex, drifting, constantly changing column of air.  To thermal efficiently, birds need to adjust their flight speed and circling radius to find, and remain close to, the centre of the thermal where updraft is highest. Thanks to the precision of the data obtained from the tags, we are able to see that Storks navigate the thermal based not only on their own perception of the airflow in their immediate surroundings, but also on a complex series of social interactions, reacting to the movement changes of Storks within their nearby subgroup, as well as the leaders of the group at the highest vertical point in the thermal.

white stork mig figure
Collective flight trajectories and synchronization in circling direction. (a),(b) Flock trajectories of migrating storks showing different flight types (circling and gliding). Grey arrows show flight direction. Tracks are colour-coded based on horizontal path curvature. The thermal is drifting with the wind resulting in distorted trajectories even if the bird flies in a perfect circle relative to the moving air (c) Curvature against time for each individual. Arrows at the top depict time delays between switches relative to first individual. (d) Horizontal trajectories of birds that switched their circling direction.

How amazing to think that each Stork is effectively acting as an individual sensor, such that the whole flock becomes a distributed sensory array.  In this way, they explore and gather information on the thermal as a group, effectively mapping its structure and enabling them to use the optimal airflow within it.

From solving ancient mysteries to changing our perception of collective movement, to simply turning a good day into an amazing one, these really are inspirational birds.  And they are pouring over our heads at the moment here in The Straits!  We’re thrilled to be assisting as always our conservation partners, Fundación Migres, with the annual autumn migration count – to date over 38,000 of them have made the crossing, and we look forward to many more inspirational moments in coming weeks!

Get some migration inspiration in your life!  Get in touch for day trips or bespoke tours this autumn, or give yourself a trip to look forward to, taking in Migration and Cetaceans in 2021 or beyond…

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The group reach optimal height and reach for Africa © Inglorious Bustards

 

 

 

 

Safe travel to The Straits is back!

As COVID-19 remains under control in Spain and cases continue to dwindle, we are extremely pleased that we can now begin to safely deliver our day trips and tours!  With the announcement of Europe-wide “air bridges” on 4 July, international travel to Spain from many countries is now available with stringent health precautions en route but no self-quarantine measures at either end of the trip.

This spring in The Straits of Gibraltar, one of the world’s most breath-taking migratory spectacles passed by almost unobserved.  But whilst we were all sequestered away, Nature carried on regardless, and now these same birds that passed by so spectacularly unseen are preparing to make their journey to their sub-Saharan wintering grounds, new offspring in tow!

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Honey Buzzard © Inglorious Bustards

We’re thrilled that, this autumn, we’ll be able bring you right to your front row seats at Nature’s greatest show either for a day or bespoke trip, or as part of a scheduled departure tour.

The Strait of Gibraltar is the point at which Africa and Europe are at their closest, and is the epicentre for one of the world’s most spectacular bird migrations.  Every year, millions of birds make the 14 km sea crossing, making use of uplifts and thermals rising off the Rock of Gibraltar and the stunning Moroccan peak of Jebel Musa. An estimated 300,000 raptors and other soaring birds pass over this rugged terrain during autumn, as well as untold thousands of other journeying passerines and seabirds.

As well as the star attraction, a boat trip into the Straits itself will let you get close and personal with our resident cetacean species – Common, Bottlenose and Striped Dolphins and Long-finned Pilot Whale.  Even migrating Fin, Sperm Whales and Orca are possible here.

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Long-finned Pilot Whale © Inglorious Bustards

There’s plenty more to explore among the area’s superb habitats, which include salt pans, intertidal areas, freshwater wetlands, low intensity farmland, Mediterranean scrub, precipitous rock faces and the woodlands of Los Alcornocales Natural Park, Europe’s largest Cork Oak forest.  The diversity and wealth of avian and other wildlife in this beautifully unspoilt area of Spain really is astounding!

Couple this with tranquil accommodation in an eco-lodge at the edge of the Natural Park itself, the chance to enjoy the picturesque streets and Moorish fortifications of the Old Town of Tarifa, and of course the chance to sample some of Andalucía’s best local sustainably-produced food and wine, and you really do have a trip that’s Strait-up fantastic!

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Short-toed Eagle © Inglorious Bustards

We can’t stress enough that the health and safety of our clients and avoiding the spread of coronavirus in wider society have been and always will be our top priorities.  We are proud to have been awarded a badge of approval for our COVID-19 Risk Prevention Protocol from both the Spanish Ministry for Industry, Commerce & Tourism, and by the local Junta de Andalucía for both tourism and “active tourism” specifically.Guía Visual Por Un Turismo Seguro con SARS-CoV2

 

RESOLUCION JUNTA ANDALUCIA SEGURA STONK

These badges mean you can book with confidence that we are fully compliant with official guidance set out by these organisations, and have in place a stringent COVID-19 Risk Prevention Protocol.

Additionally, we receive training and take advice from our independent risk prevention consultants, Quirón Prevención.

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Upon booking and arrival, you will receive a comprehensive guide on measures taken and your own responsibilities.  Here’s a summary of the measures we’re currently taking to protect you and others, which we´ll update periodically:

  • When we meet you, we’ll go over our COVID-19 Risk Prevention Protocol in detail, and introduce you to the whereabouts of hand-sanitiser and thermometer. Sadly, there’ll be no hugging!
  • You can expect our minibus to have been thoroughly cleaned using recommended virucidal products before the start of the trip, and at the end of each day, and to display clear signage about hygiene, self-protection and distance guidelines.
  • We ourselves will also be thoroughly scrubbed and wearing clean clothes that have been washed at >60ºC.
  • Only two seats per row in the minibus will be occupied, meaning you’ll be sharing with a maximum of five other people. Wearing of facemasks will be mandatory during journeys.  You’ll always have the same seat.
  • If you have your own vehicle, you may use it to follow us if you’d prefer.
  • Thanks to the nature of our passion, we’ll be mostly outside and away from crowds! Group sizes will be also be small. In the event that we can’t maintain appropriate social distance, facemasks will be worn.
  • We’ll encourage you to bring your own protective masks and hand sanitiser for frequent use, but we’ll always have a stock of these available for your use.
  • We’ll encourage you to bring your own optical equipment and not share this. We can however still lend out disinfected binoculars for your personal use during the trip.  Although we cannot share scopes, we have digi-scoping equipment that will allow you to see without coming into contact with the scope.  As always, we will have field guides with us, which we can show.
  • We have stringent procedures in place should anyone – including us – fall ill during the trip.
  • Any accommodation used or hostelry establishments visited are known and trusted, and verified to also have a COVID-19 Risk Prevention Protocol in place.
  • Our legendary picnic lunch will be provided as usual – hygienically prepared, served on disinfected reusable crockery to avoid plastic waste and stuffed full of locally sourced, sustainably produced and delicious ingredients!

We are also keeping a close eye on international travel advice from the World Health Organisation, Spanish government and relevant Foreign Offices.

We hope that with everyone’s collaboration this situation will continue to improve and we will see you soon in The Straits and beyond to enjoy the best of #FlywayBirding.

We still have limited availability remaining on our Straits of Gibraltar – Bird Migration & Cetaceans scheduled departure tour, 26th August – 1st September 2020.  We also have selected availability for day tours or bespoke trips throughout the Autumn migration season!  We are happy to take no-financial-obligation provisional bookings for future tours – just contact us to register your interest and talk further.

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Black Kite © Inglorious Bustards

 

Over 20,000 Moths in one night!!

Dave Grundy – leading authority on Andalusian moths and expert guide for Inglorious Bustards’ Mothing The Straits holiday – tells us about this phenomenal eruption of Gypsy Moths!

So, what’s the most moths you’ve ever had in your moth trap? And what’s the most of one species? I’ve heard talk of 750 Large Yellow Underwings (Noctua pronuba) in one trap in the UK and maybe as many as 2,000 total moths in the trap of all species?

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Gypsy Moth trap bedlam!! © Dave Grundy

Well this month I have had an interesting time with numbers of moths of one species in particular – the Gypsy Moth (Lymantria dispar). It causes economic damage to forestry in North America – where it was introduced – and also on a local level in Europe.

There has been a population explosion in The Straits of Gibraltar area of Andalucía, from Algeciras to Tarifa along the coast and up to about 8 kilometres inland. Beyond that, the species is flying but does not appear to be in any large numbers (we saw only 36 across 6 traps near San Roque on 27th June).

I was first aware of the larvae back on 17th May 2020 when I recorded at least 10 in my notebook when trapping at Huerta Grande, Pelayo, Andalucía, with José Manuel Gaona Ríos.  We then went to Bosque de Niebla trapping on 5th June 2020 with Rafael Rodriguez Pino when my notebook just says “millions of caterpillars stripping the oak trees of all leaves”. This must have a massive effect on the ecology of other insect species dependent on the leaves and also on bird life and others dependent on the trees and insects.  

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Gypsy Moth larvae © Dave Grundy

But is this a phenomenon to be celebrated as a marvel of nature or to be horrified about?  Could climate change be a factor? This event, which occurs cyclically every few years, is now occurring more and more often, coinciding with periods of drought.  I don’t know what the answer is. However, I am definitely not a fan of attempts to eradicate on a large scale as this causes damage to so much other wildlife at the same time.

Next I saw my first ever male Gypsy Moth in Spain on 6th June 2020 – what a stunning creature when fresh and new! This was at Centro Internacional de Migración de Aves (CIMA), Tarifa, where we do not have the oak tree foodplants for the larvae to feed on, but they disperse here looking for females, which struggle to fly far from their original location. 

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male Gypsy Moth © Dave Grundy

Numbers then began to increase with 325 recorded on 15th June 2020 and 673 on 17th June and then a stunning estimated 5,000 to one trap on 19th June in calmer weather – this was ridiculous! An estimated 4,940 came to one trap on 20th June and then numbers have been up and down since, with more on calm nights and less on windy nights.

My peak count was on 28th June 2020 when I estimated 24,850 between 5 traps and 10,900 in just one of those traps! Moth recording becomes a nightmare and I even had to wear my COVID mask because of all the scales in the air! I believe and hope we are now near the peak in numbers, so I can return to normal moth-trapping soon! 

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There seems to be a few Gypsy Moths in this trap! © Dave Grundy

But yet, how spectacular! At nearby sights just north of Tarifa I have recorded over 5,000 at La Peña and over 1800 at Punta Paloma. And to put the numbers into perspective I have now recorded since February in Spain a total of over 650 species and over 106,000 moths, but of those 60,690 have been of Gypsy Moth adult males since 6th June 2020! 

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Records of Gypsy Moths at CIMA © Dave Grundy

Breakfast with Vultures!

Going out to a restaurant isn’t something we’ve been able to do a lot of recently, but today we were thrilled to be invited to an eatery with a difference!  The menu didn’t really appeal – we’re all for trying new things but offal, rotten eggs and cow dung are a bit too avant-garde even for our tastes!  The thrill of the invite came purely from the chance to rub shoulders with the celebrity guests…

For this beastly bistro has been set up with one purpose in mind – the conservation of the Endangered Egyptian Vulture – or Alimoche as they are known in Spain.

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Egyptian Vulture © Inglorious Bustards

With its starkly-contrasting wing pattern, wedge-shaped tail and yolk-coloured face, this gorgeous bird must surely be one of the most eye-catching scavengers in the world.  It is both sensitive and intelligent, using pebbles to break eggs, sticks to wind wool, and staying faithful to partners and nest sites over long periods. Incredible travellers, migrating birds can cover over 300 miles in a single day along the East Atlantic Flyway, until they reach the southern edge of the Sahara, as much as 3400 miles from their summer home.

Sadly, the same old story of human destruction applies to this species as to many others. Their numbers have declined dramatically – in Europe, over 50% have been lost in the last three generations. Throughout their nomadic year they face many dangers.  The disastrous effects of the terrible twins threats of habitat destruction and agricultural change are exacerbated by lead and pesticide accumulation, persecution, collisions with power lines, intentional and accidental poisoning.

Around our base, in the Campo de Gibraltar and La Janda area, we are lucky enough to host a small breeding population of this stunning bird – five of the remaining 1400 pairs in Europe.

But here they face the peril of our local windfarms.  Despite the fantastically successful work of our partners at Fundación Migres to reduce raptor collisions, in recent years there have been some strikes involving Egyptians from the local population.  The presence of ornithologist “spotters” on the farms – such a successful strategy for protecting Griffon Vultures and other species – is simply not enough for these birds.  The deaths were few, but with such a tiny population, any such losses are desperately significant, and pose a risk to the birds’ future in the area. It was clear a new approach was needed.

In 2018, Fundación Migres started piloting the creation of supplementary feeding points near to Egyptian Vulture territories. The idea was that if the birds could find “easy” food at strategic points near their nests, they would no longer take risks foraging near turbines.  Turbine strikes of foraging adults would be reduced or hopefully even eliminated.

Suitable sites for supplementary feeding have to be well-located – close to one or more Egyptian Vulture territories, with a clear route to the nest that avoids windfarms. They have to be easily accessible for the feeding team, yet be quiet, safe places, away from human disturbance. Experts at Fundación Migres identified several such sites and began feeding, eventually narrowing their efforts down to the two most successful locations.

Unlike Griffon Vultures, which have evolved to work together to rip open and devour large carrion items, Egyptian Vultures love to pick up the scraps!  For this reason, they get given the piltracos – small items of meat waste and offal collected from local butchers in the Tarifa area.

In one of life’s rare win-win situations, the butchers also save the money they would otherwise pay for a waste disposal service. The meat is transferred in authorized containers to the supplementary feeding points, where it is put out four times a week.

So this morning, we stood in a secluded field while our friend and colleague Alejandro dished up 90kg of waste meat, guts, bones and other unspeakable titbits, accompanied by soothing background music from Cirl Buntings, Turtle Doves and Common Nightingales!

As well as the main feast of meat scraps, the team also puts out attractive side dishes like eggs and cow dung! For an Egyptian Vulture, these accompaniments are simply to die for – they are rich in the carotene pigments they need to give them that gorgeous yolky-yellow face. 

To measure the success of the project, the sites are checked daily and activity is also monitored using camera-traps.  Many of the birds are tagged or ringed, so a detailed picture can be built up of which individuals or pairs come to the sites and how long they spend there.

At the same time, in the wind farms, the “spotters” collect information on any birds that fly nearby.  This means that the team can make a direct comparison between days when food is laid out or not, to see if it reduces the birds’ presence in or around the windfarms.

Preliminary results of the pilot are very promising. Since the trial began, there have been no deaths of local birds on the windfarms.  The supplementary feeding points have significantly reduced the number of birds recorded near wind farms, massively reducing the risk of collision. This is especially important while they have chicks are in the nest, and adult foraging is particularly intense.

The fringe benefits of the project have also been impressive!  It seems word has got around about the hottest table in town, and the team are recording non-local Egyptian vultures and many other species coming to the feeding sites, including Griffon Vultures, Cinereous Vultures, Black Kites, Common Buzzards, Northern Goshawks and more.

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Griffon Vulture © Inglorious Bustards

At the moment one of the area’s local celebrities is also putting in an appearance every day.  A stunning adult Rüppell’s Vulture – supposed to be in sub-Saharan Africa but currently hanging out with our local Griffon Vulture colony and attempting to mate. Earlier in the Spring other vagrant individuals were recorded too, as this species gradually gains a foothold in Europe.

The project is supervised by the Andalucían Government and is coordinated with their vulture conservation team.  It is currently financed by the wind power companies.  In academic terms the project is still in early days, and nothing will be published until data has been collected for several years and the effectiveness of the measure can be properly evaluated.

In the meantime, it may not have a Michelin star or serve many vegetarian options, but Café Alimoche is definitely our new favourite eatery!

Thanks to our conservation partners and colleagues at Fundación Migres for the invite and our continued partnership.

If you love Vultures, you´ll love our Ronda & The Straits trip, timed to coincide with the virtually unknown spectacle of the Griffon Vulture migration across The Straits of Gibraltar.  Check it out here and get in touch to find out more – we´re currently taking no-obligation provisional bookings for 2020.

 

Loving the moths but missing the moth-ers!

Somewhere in a parallel universe, this weekend Dave Grundy and I would just have been saying goodbye to a group of moth-ers and wildlife lovers, having spent a week enjoying Andalucía’s lepidopteran delights!

Here’s a heartfelt message from renowned moth expert Dave, as well as some stunning photos to look back on from the excellent trip he hosted here in 2019…

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Iberian Puss Moth © David Grundy

So, this week I am sad, even though I am living in Andalucía and able to look at some great moths every morning, with beautiful sunshine as well! That’s because with fellow leader Niki Williamson, I should have been hosting ten moth enthusiasts last week, to show them the moths of Andalucía in our holiday called Mothing the Straits!

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Moth-ing The Straits 2019 © David Grundy

We would have completed six days’ worth of glorious mothing – and a further four days enjoying the area’s birds and other wildlife for those that wished to stay on. But unfortunately, due to the coronavirus situation we had to cancel this year’s holiday.  I am really gutted not to have been looking at moths with these people!

And I am sad because I am never happier than when I am sharing moths with other people and I’ve not been able to do that since lockdown began! So, I thought I would do the next best thing and show you some photos of the fantastic selection of the moths we saw on this trip in 2019, as well as some of the sites and the crack team of moth-ers!

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Spurge Hawk Moth © David Grundy

Hopefully they will inspire you to consider coming with us on the same Mothing the Straits holiday next year – we already have announced dates for 2 – 7 May 2021. But book early because places are already filling fast. Take a look at further details here, and download the checklist and trip summary here.

Again, like this year, you will have the optional extra of being able to stay on for four more days and take advantage of a birding and wildlife-watching extension. Over half the people booking on the moth tour usually book for the extension as well! And this is a stunning part of the world to view wildlife, famous for its migrating raptors, cetaceans, butterflies and reptiles as well as its moths!

So, although I’m sad about this year, I’m already looking forward to next year, why not give it a try and maybe I will see you next May?!

Dave.

We hope you can join us!  We are currently accepting no-obligation provisional bookings on future trips – contact us to express an interest or to find out more information on this or any of our trips.

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The Latin © David Grundy

 

 

A tale of two Eagles

A young Italian called Michele caused a frisson of excitement here in The Straits last month, turning up safe and well after being missing in Africa since mid-November! Not long after his reappearance he was on his adventures again, awaiting fine weather on the northern shores of Morocco before jetting across the Straits and spending the night just outside Sevilla.

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Short-toed Eagle © Inglorious Bustards

The plucky individual is a young Short-toed Eagle, satellite-tagged in 2019 as part of a collaboration between MEDRAPTORS, the Vertebrate Zoology Group at the University of Alicante (Spain), and tag providers Tecnosmart. He is a second-generation project participant – his father Egidio was one of seven young eagles tagged between 2010 and 2013, who reached adulthood and bred successfully in 2019 while still transmitting data.

This father-son team continue to shed light on the surprising and convoluted migration of Short-toed Eagles from Italy. The two-kilo eagles wear their tiny GPS tags on their backs, and the fascinating story they tell has confirmed what many suspected. Instead of beginning the journey to their wintering grounds in sub-Saharan Africa by heading directly south to Tunisia, they start with a 1600-mile flight north and west, right up through the Italian Peninsula and across southern France, before crossing the Pyrenees and migrating down through the length of the Iberian Peninsula, more than doubling their journey distance to Africa´s shores.

The reason? it´s all about wings and Straits.

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Michele’s journey – 2019 autumn migration in red and 2020 spring migration in green
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Egidio’s migrations – autumn in red, spring in yellow, 2020 spring in green

The long, elegant wings of this beautiful raptor mean it is perfectly adapted for soaring on air thermals, and it can do so for many hours, expending very little energy. But where there is no rising air – such as over expanses of water – the bird must beat those long wings to stay airborne, and becomes quickly exhausted.

Leaving the south-western point of Sicily, where Italy is at its closest to Africa, the bird would have to fly almost 100 miles to the next bit of land – an impossibility for such a long-winged raptor. So Italian Short-toed Eagles have learned to go directly against their strong instinct to head south, forcing themselves to fly north in order to eventually arrive in southern Spain. Here the mere 8.5-mile sea crossing at The Straits of Gibraltar presents much less of a challenge to a healthy, experienced bird choosing the right weather conditions.

While southerly migratory behaviour is innate, the study shows that this northerly trek must be learnt. First-year birds follow an adult who has already learnt the circuitous route to avoid the sea. Around 20% of first-year birds get it wrong and follow their hearts south, ending up wintering on Sicily because there is no more “south” to fly.

Michele was named after the late Michele Panuccio, the raptor researcher who studied the species for several years and promoted the tagging of Egidio’s first son, who was tagged a few weeks after he passed away. He left the nest site at the end of September, several days before his father, presumably following another adult bird. No doubt aided by years of experience, Egidio left late but made the journey in considerably less time. By the end of October, he had already arrived in Mauritania while Michele was still taking it easy in Extremadura!

When the lazy adolescent did finally make the crossing, the signal from his tracker was soon lost as he moved out of areas with the mobile coverage necessary to follow him. For the research team, there was nothing more to do except wait and hope that he had found his way to the wintering grounds safely. So when his tracker was spotted on the move again earlier this month, it must have been a tremendous relief!

His northward crossing of the Straits was unusual behaviour for such a young bird, as non-breeders would normally stay in Africa for another year, “finding themselves” until they come of age. Interestingly though, back in the day, dad Egidio was also a precocious exception to this rule – he too returned to the breeding grounds as a one-year-old.

This year, seven-year-old Egidio was no less keen to breed, and started his migration back to Italy as early as mid-February, arriving there by 12 March! In early March we spent some absolutely joyous days here in the Straits of Gibraltar, watching raptors arrive across the narrowest stretch of sea between Europe and Africa. We clapped them all as they arrived on our shores! We´d love to think that Egidio was one of them…

With thanks to Ugo Mellone of MEDRAPTORS and Universidad de Alicante for kindly giving permission for citation and reproduction of maps and data.

REFERENCES

Agostini N., Baghino L., Coleiro C., Corbi F. & Premuda G. 2002. Circuitous autumn migration in the Short-toed Eagle (Circaetus gallicus). Journal of Raptor Research 36: 111-114

Mellone U., Limiñana, R., Mallìa E. & Urios V. 2011. Extremely detoured migration in an inexperienced bird: interplay of transport costs and social interactions. Journal of Avian Biology 42: 468-472

Mellone U., Lucia G., Mallìa E., Urios V., 2016. Individual variation in orientation promotes a 3000-km latitudinal change in wintering grounds in a long-distance migratory raptor. Ibis DOI: 10.1111/ibi.12401

Panuccio, M., Agostini, N. & Premuda, G. 2012. Ecological barriers promote risk minimization and social learning in migrating short-toed snake eagles. Ethology Ecology and Evolution 24: 74-80.

Boosting the Count

The eBird database just received a significant boost, in the form of information on almost two million migrating birds from our conservation partners, Fundación Migres!

Many is the joyous day we’ve spent with our conservation partners Fundación Migres, helping with the autumn migration count, gazing up spellbound as literally thousands of raptors migrate over our heads. Horizontal in deck chairs, to the casual observer the team of volunteers must look super-relaxed, but often this couldn’t be farther from the truth! Raptor species and sections of sky have been allocated, clickers have been distributed, and now it is our responsibility to painstakingly count the mind-boggling numbers of migrating soaring birds crossing the Strait of Gibraltar, ensuring our contribution to the Migres legacy is a worthy one.

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Whirring clickers as raptors come in from all directions © Inglorious Bustards 

This work of science and passion combined began over twenty years ago in 1997, making it one of the longest running avian migration monitoring programmes in Europe. The importance of the data it generates cannot be over-emphasised – around three-quarters of the soaring birds that breed in Europe pass through this migration bottleneck, including endangered species such as the Egyptian Vulture. The vast quantities of data generated by the counts carry a powerful amount of information about the fortunes of these birds.

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Egyptian Vulture © Inglorious Bustards

And now, in a big step to make this data more available, several years’ worth have been digitised and uploaded to eBird! All the data generated by the Migres Program from the autumn monitoring campaigns for soaring birds (raptors and storks) 2012-2016 and seabirds 2012 -2013 is now on the site.

The data include over 90,000 records of over a million-and-a-half soaring birds of more than 35 species; and about 20,000 records of 200,000 seabirds of over 40 species. It is also a dataset of enormous qualitative value, having been collected in a systematic and standardised way over many years.

The data come from the daily counts that take place throughout the autumn from Cazalla and El Algarrobo bird observatories near Tarifa, Andalucía. The seabird census is carried out from the Isla de Las Palomas in Tarifa, within The Strait of Gibraltar Natural Park. All is now included in the data logged for the corresponding eBird “Hotspots”. It makes for quite an interesting view on screen – we can’t imagine there are many Hotspots that have been allocated over 30,000 checklists!

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eBird data (www.ebird.org) and Google Maps

Once the counts are completed, the data becomes public information, provided for free to eBird by the Andalucian Environmental Information Network (REDIAM) of the Ministry of the Environment and Spatial Planning of the Andalusian Government. The massive volume of data for the years in question was then incorporated into the eBird database by the eBird Spain team.

The importance of the data from these seasonal counts cannot be overemphasised. Without a doubt, it is a first-rate contribution not only to the eBird database, but to the knowledge of avian migration at a national and global level.

Seeing those huge numbers on screen can never be quite as mind-blowing as seeing the phenomenon in person! We feel super-privileged to be involved with such an epic project, and to see the results of the hard work from the most skilled, knowledgeable and loveliest bunch of volunteers and staff you could wish to meet.

Fancy contributing to science from a deckchair?!  Contact Fundación Migres about upcoming volunteer opportunities.

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The Inglorious Bustards / Fundación Migres clan! © Inglorious Bustards

Mysterious migrations of the deep!

We often think of the Straits of Gibraltar as a barrier to be overcome, a great leap of faith for the hundreds of thousands of birds that must move between the land masses of Africa and Europe. But through the eons, other vast, invisible migrations have gone almost unseen in the dark depths beneath the sparkling surface.

Here we chat to our friend Aurelio Morales, owner of family-run cetacean-watching company Marina Blue, to find out why, for marine mammals, “The Strait of Gibraltar is a vast underwater canyon – a great corridor that links the Mediterranean and the Atlantic”

Aurelio has spent twenty-two years of his life around the marine fauna of the Strait of Gibraltar. “There is something special about this place that hooks me. Two seas, two tectonic plates, two continents, two prevailing winds… Each outing is completely different. There is no one equal to the other, since the weather and light changes, the behaviour of the species varies throughout the days”

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Bottlenose Dolphin © Inglorious Bustards

His trips are full of encounters with our local resident delphids – Common, Striped and Bottlenose Dolphins, highly-sociable Long-finned Pilot Whales, and even Orcas in summer – but he is particularly fascinated by the mysterious movements and spectacular sudden appearances of the area’s two migrant species – Fin Whales and Sperm Whales.

“We have so many experiences with these two species that never cease to amaze me. We have seen on many occasions Sperm Whales jumping right out of the water, dragging a large body of water as if it were an explosion in the sea. We have witnessed fascinating interactions between Sperm Whales, Long-finned Pilot Whales and Bottlenose Dolphins. Yellow-legged Gulls will perch on top of a resting whale and clean its dead skin. We have seen Hammerhead Sharks circling them while they rest on the surface.”

But although they are seen regularly and often with great intimacy from Aurelio’s small yacht Miamita, much remains unknown about the movements of these two peaceful giants of the seas.

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Out with Marina Blue!

“We consider Sperm Whales to be semi-residents here. They spend long periods in the Strait feeding, mostly on deep sea squid.”

“In the Strait we almost invariably see adult males of up to 15m in length – and occasionally younger males of around 7-10m. They use this underwater corridor for their movements to and from feeding and mating areas.”

Male and female Sperm Whales generally don’t hang out. The males are loners, found in higher latitude cold waters, whilst the females, calves and young adults form gregarious and relatively sedentary groups in tropical and temperate seas. They meet up only to mate, with the males performing seasonal migrations. They find each other across vast distances – their huge jelly-filled heads directing and amplifying their song to volumes louder than a jet engine.

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Sperm Whale © Inglorious Bustards

Research in 2011 used photo-cataloguing of tail flukes – from which individuals can reliably be identified – to compare Straits whales with records from across the Mediterranean and Atlantic. Of 47 Sperm Whales identified here, fifteen could be traced travelling throughout the western Mediterranean, a straight-line distance of up to a thousand miles.

The fact that none of “our” Sperm Whales from this study were recorded in the Atlantic supports existing genetic evidence of an isolated sub-population within the Mediterranean Sea. Believed to contain fewer than 2,500 mature individuals, the Mediterranean population is considered ‘endangered’, based on IUCN Red List criteria.

However, Sperm Whale social groups, with females and calves, do turn up in the Strait from time to time. We recall an incredible experience in September 2017, watching a group of ten females and young whales. They were grouped tightly together in a “marguerite formation”, where the group surrounds a weak or injured individual with their tails pointing outward, enabling them to protect it from attackers. The gathering seemed to emanate tension and anxiety, as the sea around them boiled with curious dolphins and seabirds eyed them suspiciously from above.

The happening was during a series of strong hurricanes over the Atlantic. Could this troubled group have been Atlantic in origin, having come into The Straits to shelter?

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Sperm Whales defend themselves in a “marguerite” formation © Inglorious Bustards

There is clearly more work to be done, says Aurelio. “Collaborative studies are currently being carried out between different companies, associations and scientists to verify that the same species seen in the Strait are being seen in other places such as the Canary Islands and Azores.”

Fin whales, the world´s second-largest living creatures, can reach lengths of up to 25m. They used to be abundant in the Strait of Gibraltar and nearby Atlantic areas until their rapid collapse due to intense whaling at the beginning of the 20th century. They are now considered endangered.

Evidence gathered from fifteen years’ worth of photo-identification suggest that some of the Fin Whales seen in the Mediterranean are actually of Atlantic stock.  A small community of them have been observed migrating through the Strait of Gibraltar, with remarkable seasonal directionality. They head to the Atlantic Ocean in May-October and the Mediterranean Sea in November-April. Observations of young whales exiting the Mediterranean Sea mainly in May-July suggest that at least part of this community is likely to calve in the basin, probably near the Balearic Islands.

“The Mediterranean is a semi-closed sea with warmer temperatures, so it would make sense that females raise their calves there until they gain enough weight to move to cooler feeding areas.” says Aurelio.

But, he says, there are many threats to these amazing creatures as they try to navigate the busiest shipping lane in the world.

“The greatest dangers for these large cetaceans are almost always related to human presence. The Strait is the only channel that connects the Atlantic with the Med and carries massive shipping traffic. Whales are injured colliding with large ships, and noise pollution interferes with echo-location, and therefore migration. Pollution from oil spills and plastic waste is another great problem that these animals face with this unbridled progress that prevails over the conservation of Nature.”

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Long-finned Pilot Whale © Inglorious Bustards

As a wildlife tour operator, and erstwhile skipper for the Ministry of the Environment, he feels a great sense of responsibility to make sure Marina Blue’s own effects on the environmental are only positive, in line with our own #FlywayPromise.

“There are thankfully many legal requirements to operate here, in terms of good practices regarding cetacean observation and compliance with EU emissions regulations and speed limits, which we naturally comply with. But we also have our own manual of good practices, guided by our own conscience and respect for Nature!”

“Marina Blue works in and for the Strait, with small groups of no more than ten people per trip to minimise our impact. We separate and reduce all our waste. We enjoy the animals with the utmost respect, quietly, allowing them to come to us if they wish. We must always bear in mind that we do not own this planet.”

We love heading out with Aurelio and his crew during selected trips, because of the intimacy of the encounters allowed by such a small vessel, but also because of his obvious deep connection and passion for the wildlife we are hoping to observe. With each spell-binding sighting of one of these incredible animals, we learn a little more about how to protect them.

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The crew!