Bird that makes the longest migration in the animal kingdom (4)

I believe the answer is:

tern

(Other definitions for tern that I've seen before include "Gull-like seabird" , "Small slender gull" , "Seabird related to the gull" , "Small gull with forked tail" , "Seabird, sounds like become sour" .)

I've seen this clue in The New York Times.

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