Gull ID

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Cardinal15
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Gull ID

Postby Cardinal15 » Mon Mar 16, 2020 6:14 pm

Found this gull at Lake Rotoma on the 1/3/20. It was with similar-looking gulls. Differences were distinctive yellow legs and a more yellow bill compared to the surrounding gulls, and sleeker body. It was also the first gull to fly when approached. This gull also had a significantly different bill.
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Davidthomas
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Re: Gull ID

Postby Davidthomas » Mon Mar 16, 2020 7:32 pm

Looks like a fledgling black-billed gull to me, longer finer Bill, slighter Bird overall and a more round head compared to the juvenile redbilled gull which has a much chunkier shorter bill
Finn Davey
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Re: Gull ID

Postby Finn Davey » Mon Mar 16, 2020 9:40 pm

Juvenile Black-billed gull.
Much longer and thinner bill, much more pale coloured than the Red-billed juvenile next to it and no/less brown spots on wings.
Clinton9
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Re: Gull ID

Postby Clinton9 » Wed Mar 18, 2020 12:59 am

See this...

Black-billed gull-paler grey back and longer thinner black beak
Red-billed gull-darker grey back and shorter thicker red beak

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Finn Davey
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Re: Gull ID

Postby Finn Davey » Wed Mar 18, 2020 9:16 am

Got the wrong genus there.
Red-billed Gulls and Black-billed Gulls are no longer in the genus Larus, they're in the genus Chroicocephalus now and have been for a while.

You'll also notice that Black-billed gulls have less black on their wing tips, the black is at the very edge while Red-billed Gulls have an entirely black wing tip.

Black-billed Gulls also have smaller pupils, this is noticeable in adult birds.
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simon.fordham
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Re: Gull ID

Postby simon.fordham » Wed Mar 18, 2020 10:05 am

As always, Finn, this depends on which taxonomical reference you choose.

There is no single international standard. IOC use Chroicocephalus but NZ Birds Online and Birdlife International both use Larus.

Simon
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Oscar Thomas
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Re: Gull ID

Postby Oscar Thomas » Wed Mar 18, 2020 11:45 am

I will also mention that pupil size is not a defining characteristic for most (if not all) bird species as it is constantly regulated and changing. Black-billed Gulls can have smaller or larger pupils as a response to light intensity, but there are also some species that alter their pupil size as a display technique.
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Cardinal15
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Re: Gull ID

Postby Cardinal15 » Wed Mar 18, 2020 12:57 pm

Thank you. Much appreciated. I just got a bit confused with the yellow legs.

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