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Old Tuesday 7th March 2017, 22:05   #3226
Don Listerino
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Hi Lou, thanks very much for your help,

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Old Sunday 23rd April 2017, 07:36   #3227
ekopa
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Hello!

There is a place near Moscow (Biserovo fishery ponds) where all gull enthusiasts go. The most abundant spieces are Common Gulls, Black-headed Gulls, Herring Gulls and Caspian Gulls. Depending on the season and the luck one can see fuscus LBBG, Heuglin's Gulls and more rarely GBBG and Glaucous Gulls.

I suspect there should be 1cy Steppe Gulls (barabensis) in autumn. Is there a way to separate them from Caspian Gulls?
Also no-one registered YLGs, which seems strange. I suspect we just cannot single them out from huge flocks of Herring/Caspians

Here is the typical mixture of Herring and Caspian Gull, photographed in October
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Old Thursday 18th May 2017, 09:32   #3228
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GBBG with yellow-ish legs.

In the past week, here on the Camel Estuary in Cornwall, I have noticed at least 3 adult Great Black-Backed Gull (Larus marinus) with straw-yellow, some Greenish yellow legs. What do you think the most likely explanation for that could be? Hormonal mechanisms, hybrid of 'Larus michahellis' or 'Larus fuscus', or even hybrid 'Larus dominicanus' extending north?
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Old Thursday 18th May 2017, 09:42   #3229
lou salomon
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yellowish legged GBBG have occured ever since (in e.g. baltic sea they are a regular sight), but this year particularly there seems to be going on something in the north atlantic/north sea: colour ringed herring gulls which in other years had normal fleshy coloured legs this year show yellow legs as noted by some dutch birders. speculations goes towards nutrition with maize, but who knows what humans have have added somewhere in their feeding places.
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Old Friday 19th May 2017, 19:34   #3230
Qingcol
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Originally Posted by lou salomon View Post
yellowish legged GBBG have occured ever since (in e.g. baltic sea they are a regular sight), but this year particularly there seems to be going on something in the north atlantic/north sea: colour ringed herring gulls which in other years had normal fleshy coloured legs this year show yellow legs as noted by some dutch birders. speculations goes towards nutrition with maize, but who knows what humans have have added somewhere in their feeding places.
Interesting stuff Lou, Thank you. I suppose that the leg colour is carotenoid-based, a parasite could be to blame.
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