Crossword Genius

Common duck, the male of which has a dark green head and reddish-brown breast (7)

Ross

I believe the answer is:

mallard

(Other definitions for mallard that I've seen before include "Ancestor of all domestic ducks" , "Type of duck - world speed record holding steam engine (1938)" , "web-footed bird" , "Oldest breed of duck" , "Common wild duck" .)

I've seen this clue in The Mirror.
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