Wader n. : One who, or that which, wades.

Wader n. : Any long-legged bird that wades in the water in search of food, especially any species of limicoline or grallatorial birds; -- called also wading bird. See Illust. g, under Aves.

Example:


Taxonomy
waders, Family, shorebirds, species, Paton, birds, Suborder, suborder Charadrii, free encyclopedia, Baker, phylogeny, Molecular Phylogenetics and Evolution, Chionidi, Thinocori, Aves, Scolopaci, wading birds, bills.

Defination from the web:
waders, are closely related to the seabirds. ... In the Sibley-Ahlquist taxonomy, waders and many other groups are subsumed into a greatly enlarged Ciconiiformes order. ...