A sea bird of the family Stercorariidae (4)

I believe the answer is:

skua

(Other definitions for skua that I've seen before include "Large predatory bird" , "Predatory northern seabird" , "Large relative of the gull" , "Gull-like rapacious bird" , "Large predatory seabird" .)

I've seen this clue in The Independent.

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