A wading bird is any of a group of long-legged birds, such as cranes, herons or storks, which wade in shallow water in search of food.
avocet
avocet
Avocet
Avocet
I'd check that "I" is definitely the fourth letter, because "egret" could be the answer.
heron
avocet
Rail.
ibis
American Bittern
Bittern, Limpkin.
grebe