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[Gulls] Yellow-legged Gull (Mongolicus) 黃腳銀鷗(亞種)

This is a first-winter Larus (cachinnans) mongolicus (Yellow-legged Gull), and is probably the same as the second individual at the following link:

http://www.hkbws.org.hk/BBS/viewthread.php?tid=9793&extra=page%3D1

The tail band is too narrow for Slaty-backed, on which it usually covers most of the tail. The overall colour of the bird is rather pale, which is not correct so early in the first winter.

While the bill is, as you say, quite large, so is that of mongolicus.

Good photos!

Geoff

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Having looked at this again, I realise this is not mongolicus.

I think it's just a heuglini. The greater coverts are rather plain, and there is no prominent inner primary window.

The rather narrow tail band suggests that some vegae genes may by present.

GeoffC

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