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.
A peltrel is one bird and a dipper is another bird who has a six letter name.
avocet
avocet
avocet
Avocet
Avocet
I'd check that "I" is definitely the fourth letter, because "egret" could be the answer.
Rail.
avocet
ibis
heron
Bittern, Limpkin.
American Bittern
grebe