Bird found on all seven continents (4)

I believe the answer is:

tern

(Other definitions for tern that I've seen before include "Seabird related to the gull" , "Pay rent for seabird" , "Small gull with forked tail" , "Long-winged aquatic bird" , "Sea bird, a small gull" .)

I've seen this clue in the LA Times.

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