Listened to a group of animals, say (5)
I believe the answer is:
heard
'listened to' is the definition.
(I've seen this in another clue)
'a group of animals say' is the wordplay.
'a group of animals' becomes 'herd' (I've seen this before).
'say' indicates a 'sounds like' (homophone) clue.
'herd' sounds like 'HEARD'.
(Other definitions for heard that I've seen before include "Traditional children shouldn't be" , "Got to know (of)" , "Perceived sound" , "Received aurally" , "Caught - picked up" .)