Rather stocky tern with a thick black bill. Breeding birds have an entirely black crown.
Breeding birds have an entirely black cap. Thick black bill is the key field mark.
Gull-billed Terns often form mixed-species flocks while loafing on coastlines.
Stocky tern with a thick black bill and black legs. Nonbreeding birds have a dark smudge behind the eye.
Juveniles have a smudgy gray patch behind the eye and a thick bill that is often pale at the base.
Note notched tail and flight and dusky tips to the primaries.
Stocky with a thick black bill and black legs. The crown is entirely black.
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