Wader

n. one who wades; wading boots; wading bird (heron, egret, flamingo, etc.)

Waders, called shorebirds in North America (where "wader" is used to refer to long-legged wading birds such as storks and herons), are members of the order Charadriiformes, excluding the more marine web-footed seabird groups. The latter are the skuas (Stercorariidae), gulls (Laridae), terns (Sternidae), skimmers  (Rhynchopidae), and auks (Alcidae). Also, the pratincoles (Glareolidae) and the Crab Plover (Dromadidae), which bear greater resemblance to waders, are closely related to the seabirds.
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Noun
1. any of many long-legged birds that wade in water in search of food
(synonym) wading bird
(hypernym) aquatic bird
(hyponym) stork
(derivation) wade

n. wader

(n.)
One who, or that which, wades.
  

(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.