Wetland birds are a diverse group of species that inhabit wetlands, such as marshes, swamps, and estuaries. Terns, egrets, and herons are all examples of wetland birds. Terns are small to medium-sized seabirds with long, pointed wings and forked tails. Egrets are large wading birds with long legs and necks, and long, thin bills. Herons are long-legged wading birds with long, sharp bills and typically have a hunched posture. All three of these species can be found in wetlands around the world.