The group called Waterbirds consists of a wide variety of 210 species of seabirds, coastal birds, wading birds, and wetland birds. It includes many familiar birds, such as Atlantic puffins and great blue herons, as well as inconspicuous marsh dwellers, such as black rails. Pelagic birds and colonial nesting birds are also included in this group. Marsh dwellers or "Marshbirds" encompass non-colonial, non-waterfowl aquatic species including loons, bitterns, non-colonial grebes, rails, gallinules, coots, limpkin, and cranes.
Waterbird Conservation for the Americas