Slow-moving birds? (4)

I believe the answer is:

owls

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

'slow-moving' is the wordplay.
'moving' is an anagram indicator.
'slow' with letters rearranged gives 'OWLS'.

(Other definitions for owls that I've seen before include "Wise old birds - quite slow" , "Night birds" , "Strigiform creatures" , "Slow kind of birds" , "Members of Parliament" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app