Symbol of the National Audubon Society
I believe the answer is:
egret
'symbol of the national audubon society' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for egret that I've seen before include "Greet (anag) -- wading bird" , "White-plumed wader" , "one with plume" , "One of a pair of waders" , "Mainly white heron" .)