Vietnam Gull (1 Viewer)

[dalat]

Some Gulls were resting next to Caspian Terns in the Mekong Delta, a few days ago. Next to the terns, they seem a bit too large for Black-headed, so is it Brown headed? But not sure if the wing pattern of the flight pic is right...

 

[Nutcracker]

Bird in flight in 2nd pic is definitely Black-headed.

 

[dalat]

The flying bird is the same as the 3rd bird from left in the first pic.

 

[BobbitWorm45]

Agree with Black-headed Gull

 

[dalat]

So you think no problem with the size, Black-headed Gull can appear almost as large as Caspian Tern?

 

[foresttwitcher]

Black-headed Gull: length 35-39cm; wing span 89-99cm.
Caspian Tern: length 48-55cm; wing span 96-111cm.

So the Caspian Tern should look larger (mainly longer) than the Gull but there is a difference in size in the photo between the various Terns - so perhaps within variation.