Crossword Genius

Its peregrine variety is the world's fastest avian (6)

Ross

I believe the answer is:

falcon

(Other definitions for falcon that I've seen before include "high-flyer" , "Diving bird of prey" , "Hunting bird like peregrine or merlin" , "Kestrel, for example" , "Long-winged hawk" .)

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