December saw Lee and I
heading off with 9 other British and Irish ringers to the Kartong Bird Observatory
in The Gambia for an 11 day ringing expedition. The objectives being to learn
more about migrant Western Palearctic birds on their wintering grounds and to
increase the limited knowledge of West African birds.
Located on the coast, near
the border with Senegal the habitat surrounding the observatory is a mixture of sand dunes,
beach, mangroves, coastal scrub with pockets of remnant forest. The observatory
itself overlooks a former sand mine, which during the rainy season fills with
water. These pools contain extensive reed and rush beds which provide refuge,
roosting and breeding sites for a huge variety and number of birds, along with
the occasional crocodiles!
Ours days involved mist
netting in the mornings in one of these varied habitats, followed by setting new
nets or more mist netting in the afternoon. After dark we would head out
dazzling, using lamps to catch waders and nightjar.
Two evenings we headed for
the beach, setting up nets to catch waders and seabirds, the first of which was
particularly successful catching a number of sandwich terns including one that
was ringed as a chick earlier in the year off Northumberland!
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Setting tern decoys on the beach |
Other activities including
flick netting amongst the cattle for oxpeckers and whoosh netting for vultures.
In total we caught over 1200
birds of 121 species, and most importantly 250 Western Palearctic passerines, including birds we regularly encounter
at home such as reed warblers, chiffchaffs and whitethroats and others that are
more often seen on the continent such as the beautiful melodious and subalpine warbler. Other highlights for me included ringing my first nightingale and two
of 19 woodchat shrikes!
As well as this we caught birds
doing unusual moults, or what we think are unusual! With comparatively little
ringing done here we are learning so much that seems odd but could be the norm!
On this trip we caught a juvenile chiffchaff that was undergoing active moult
(it was growing and replacing some of its flight feathers) and one which had
obviously just finished growing its last three flight feathers. Now juvenile
chiffchaff’s that breed in Britain undergo a partial moult (they moult body feathers
but not flight feathers) before migrating south to the Mediterranean, North and West coast of Africa. They keep these old flight feathers all through the winter and during
the breeding season back in Europe, before finally replacing them after breeding. So
what were these chiffchaff’s doing? Recent work on the Iberian Chiffchaff
(recently described as a separate species) indicates that some juvenile birds
of this species moult some of the outer flight feathers during their post
juvenile moult. However, this is usually finished by the end of September
before they migrate south and one of our birds was still in active moult!! It
must be remembered that little is known about the moult strategy of this
species and just highlights how important the work of the Kartong Bird Observatory
is!
Another interesting Western Palearctic species caught was an Eastern Olivaceous Warbler (North
African race reiseria), which turns out is a new species for The Gambia.
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Eastern Olivaceous Warbler - North African race reiseria |
Of course we also caught a
lot of African birds, which ranged in colour, size, shape and ferociousness! Once
again we were at the cutting edge of knowledge for these species, every bird
providing new information on moult, breeding…even identification!
Weaver's presented a particularly difficult ID challenge, since they were in non-breeding plumage and needed wing and head measurements to identify them and with large flocks forming by the end of the trip, we needed all hands of deck to get them out of the nets!
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Extracting over 100 weavers from the nets! |
I particularly enjoyed
learning about the long-tailed nightjar of which we caught 70 and the
kingfishers. We caught 7 species of kingfisher ranging from the giant
kingfisher to the African pygmy kingfisher, although my favourites were the pied
kingfisher and malachite kingfisher with its rather funky hair do!
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Pied, Giant and Pygmy Kingfisher |
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One of my favourites, the Malachite Kingfisher |
All in all it was a
fantastic trip and a huge thank you needs to go to Colin Cross and his wife
Binta, our helpers Manuel, Moses, Dembo and Abdoulie, Hanni and the guys at
Lemonfish for feeding us and putting up with having ringing equipment
everywhere and constantly changing meal times! To Jez for organising the trip
and for all the team members who helped make it such a wonderful trip!
Another account of the trip
from one of the other team members, Sam Bayley can be found at his Blog http://horshamringers.blogspot.com/
and includes a rather interesting encounter with 23 leeches!
Information on Iberian
Chiffchaff moult can be found here http://www.ibercajalav.net/img/380a_IberianChiffchaffPibericus.pdf
Below are just a very small selection of a few other birds caught...
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Lanner Falcon |
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Common Wattle-eye (female) |
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Blue-cheeked Bee-eater |
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Long-tailed Nightjar |
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Jacana |
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Little Bittern |
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Melodious Warbler |
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Squacco Heron |
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Grey-headed Bush Shrike |
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Grey Kestrel |
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Nightingale |
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Pied Kingfisher |
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Giant Kingfisher |