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What gulls are they?

Mai Po today.  Thanks in advance

First gull
[url=http://www.fotop.net/seaeagle/Misc/110123_Mai_Po_424][img]http://images1.fotop.net/albums6/seaeagle/Misc/110123_Mai_Po_424.jpg[/img][/url]
Different angle of the first gull
[url=http://www.fotop.net/seaeagle/Misc/110123_Mai_Po_434][img]http://images1.fotop.net/albums6/seaeagle/Misc/110123_Mai_Po_434.jpg[/img][/url]

Second gull.  I believe this gull is different from the first one due to the bill color
[url=http://www.fotop.net/seaeagle/Misc/110123_Mai_Po_435][img]http://images1.fotop.net/albums6/seaeagle/Misc/110123_Mai_Po_435.jpg[/img][/url]

Third gull.  Is this Heuglin's Gull?
[url=http://www.fotop.net/seaeagle/Misc/110123_Mai_Po_455][img]http://images1.fotop.net/albums6/seaeagle/Misc/110123_Mai_Po_455.jpg[/img][/url]

They are all Heuglin's Gulls. First-years and adult.

GeoffC

Thanks, Geoff.