Hard to tell because it's facing away, but i would guess Gull-billed Tern, Little Tern, or Common Tern. links:
http://en.wikipedia.org/wiki/Gull-billed_Tern
http://en.wikipedia.org/wiki/Little_Tern
http://en.wikipedia.org/wiki/Common_Tern
Let me know if any of you think otherwise
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