Mystery Bird: Crested Tern, Thalasseus (Sterna) bergii

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[Mystery bird] Crested Tern, also known as the Swift Tern or Great Crested-tern, Thalasseus (Sterna) bergii, photographed at Michealmas Cay, Great Barrier Reef, Australia. [I will identify this bird for you in 48 hours]

Image: Steve Duncan, 24 August 2009 [larger view].

Nikon D200 w/ Nikkor 300mm f/4.

Please name at least one field mark that supports your identification.

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I agree, a large tern with yellow bill, white forehead and shaggy black crest- (Greater) Crested Tern.