查看完整版本: Is it a White-winged Tern?

Is it a White-winged Tern?

[size=3][b]Is it a White-winged Tern? Thank you very much!

17/09/2009 Mai Po Access Road[/b][/size]

[img]http://images4.fotop.net/albums2/hokszewong/WhiteWingedTern/17Sep09_0115s.jpg[/img]

[img]http://images4.fotop.net/albums2/hokszewong/WhiteWingedTern/17Sep09_0116s.jpg[/img]

[img]http://images4.fotop.net/albums2/hokszewong/WhiteWingedTern/17Sep09_0117s.jpg[/img]


[size=3]And how about the left handside one? It has a forktail! So is it a White-winged Tern too?[/size]
[img]http://images4.fotop.net/albums2/hokszewong/WhiskeredTern/17Sep09_0134s.jpg[/img]

[[i] Last edited by Sze at 17/09/2009 23:56 [/i]]

Sze -

Yes, this is a White-winged Tern [i]Chlidonias leucopterus[/i]. The head pattern - a more-or-less isolated black spot behind the eye - is strongly indicative of winter plumage [i]leucopterus[/i](although Whiskered Tern can very occasionally appear similar!)

The black mottling on the underwing coverts, which is clearly visible in the photographs, confirms that this is an adult [i]leucopterus[/i] moulting from summer to winter plumage.

I suspect the bird in the 4th photo is the same bird.

david

[size=3]Oh! David !Thank you for you reply and information!
Thank you so much! [/size]3551875328cc445

[quote]Original posted by [i]ddavid[/i] at 19/09/2009 18:56 [url=http://www.hkbws.org.hk/BBS/redirect.php?goto=findpost&pid=22213&ptid=8871][img]http://www.hkbws.org.hk/BBS/images/common/back.gif[/img][/url]
Sze -

Yes, this is a White-winged Tern Chlidonias leucopterus. The head pattern - a more-or-less isolated black spot behind the eye - is strongly indicative of winter plumage leucopterus(although Whi ... [/quote]