Hi,
I visited Hird Swamp on Sunday and saw a huge number of
Whiskered Terns there, several hundred of them. Anyway,
I noticed some white ones and wondering whether they
are Whiskered or WW Black Terns.
I have photographs, but I am still unsure. Some of the
seem to have 'headphones', but im not sure if that the
main way of identification. Also in all books I have,
(at least 8 books I have list this species), all Black
Terns have a dark carpal bar. (On the leading edge) and
Whiskered dont. These are visible in many of the birds
I saw at Hird Swamp. Also noted some of them with square
tails.
My question is whether these birds I saw are Whiskered or
WW Black Terns. Would there be Non-breeding Whiskered at
this time of the year? I guess possibly immature ones, but
what about non-breeding? All Black Terns would be non-breeding
or immature.
I will send a brief report of my whoel trip when I have time.
Regards,
Vin.
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