Avian noise (8)
I believe the answer is:
birdsong
(Other definitions for birdsong that I've seen before include "sound of morning, say" , "tweet" , "Twitter" , "Harmonious twittering" , "Dawn chorus etc - book by Sebastian Faulks" .)
I believe the answer is:
birdsong
(Other definitions for birdsong that I've seen before include "sound of morning, say" , "tweet" , "Twitter" , "Harmonious twittering" , "Dawn chorus etc - book by Sebastian Faulks" .)