I didn't do this sooner because I did not have the internet. I suppose it is a Gull-billed Tern. I know you will put me right.
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I am not yet convinced; surely a black-headed gull would not have black legs and beak
The light isn't helping but the legs are red and there is traces of red in the bill. As I say the light is making them look darker, I think.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
If you compare the shape of the 'black head' in this photo with these of gull-billed terns http://www.naturspesialisten.no/article.php?id=276 you can see that on the terns it's more like a black cap that extends down the back of the neck, whereas on the black-headed gull it's more of a brown hood that has slipped forward!
Lat/Lng: 54.5965, -1.2256
OS grid ref: NZ501226
Rspb first hide from the offices.