Definitions for wading bird
Random House Webster's College Dictionary
any of various long-legged, long-billed, and long-necked birds that wade in shallow waters for live food, as the crane, heron, ibis, stork, spoonbill, and flamingo.
Origin of wading bird:
wading bird, wader(noun)
any of many long-legged birds that wade in water in search of food
Any of various long-legged birds, of the order Ciconiiformes, such as cranes, herons, or storks, that wade in shallow water in search of food.