Thank you, ddavid.
The second and third photos were taken from the same bird and following your advice, I have checked that the black marks on the body match very well the boundary between white and black colours of white-winged tern in breeding plumage. Hence it should be white-winged tern moulting to non-breeding plumage as you advised.
All photos were taken from the same flock of birds that flew over the bird hide on last Saturday.
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Last edited by irsychan at 15/09/2014 13:34 ]
