leo2012 12/08/2018 10:20
Common Tern 普通燕鷗
Tolo Harbour 吐露港
07-08-2018
[img]https://farm1.staticflickr.com/940/30118541828_86daf57f98_b.jpg[/img]
[img]https://farm1.staticflickr.com/932/30118541718_2c6c9cfde2_b.jpg[/img]
[img]https://farm1.staticflickr.com/941/42177900890_74baa45e46_b.jpg[/img]
[img]https://farm2.staticflickr.com/1793/30118541528_72d9591772_b.jpg[/img]
[img]https://farm2.staticflickr.com/1811/42177900720_6ebdb5b86a_b.jpg[/img]
[img]https://farm2.staticflickr.com/1795/43081389565_30a2d3f9c7_b.jpg[/img]
ajohn 16/08/2018 13:48
I think that this is actually a Roseate Tern rather than Common Tern. The bill looks too long/slender for Common, and the outer tail feathers are completely white - Common Tern has a black shaft on the outer tail which is very difficult to see in the field but would be visible on these excellent photos.
I think the confusion for ID arises because of the black bill, but the bill on Roseate Tern is black outside the breeding season - I think the pale tip on this bird may be because the bill is in the process of changing colour.