Crossword Genius

Terribly slow birds (4)

Ross

I believe the answer is:

owls

'birds' is the definition.
(owl is a kind of bird)

'terribly slow' is the wordplay.
'terribly' indicates anagramming the letters.
'slow' with letters rearranged gives 'OWLS'.

(Other definitions for owls that I've seen before include "Nocturnal birds" , "Strigiform creatures" , "Slow (anag) -- birds of prey" , "Night birds" , "Nocturnal hooters?" .)

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