Green Heron (Butorides virescens) Science Article 3
abstract
The ‘pumping’ of the Bittern and the ‘cooing’ of the Least Bittern may be classedu nder the head of song,b ut for the Herons as a group there seems to be singularly little recorded in the way of a coUrtShip song
CHARLES W. TOWNSEND, The AUK, Vol. 45, 1928