Unknown bird, Darwin Harbour

[Bill Stent <>]

Hi folks, Bill here

I've just got back from Darwin (including a terrific morning's birding followed 
by lunch with Denise Goodfellow), topping a three week drive from Melboring.

There are a number of things that are bugging me, top of the list being a bird 
I spotted at great distance on Darwin Harbour - that is, feeding near the 
sewerage outfall south west of Government House (hmm, I wonder if there's any 
connection there...?)

I've got two photos, one reasonable, one not so great, links below.  So far, 
candidates are Gull-billed Tern (non-breeding), White-winged Black Tern 
(non-breeding) and even a Red-tailed Tropicbird.  Unfortunately, at such a 
distance I wasn't able to get a good idea as to how large the bird is, but I'd 
say it's not huge, but probably larger than a small Tern.  The feet seem to be 
red, although it's been suggested that this may actually be chromatic 
aberration in the lens.

Suggestions?

http://www.facebook.com/photo.php?pid=419115&l=9b5e3c6a8a&id=100000148897455

http://www.facebook.com/photo.php?pid=419116&l=afe5425834&id=100000148897455
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