The limpkin (Aramus guarauna), also called carrao, courlan, and crying bird, is the only extant species in the genus Aramus and the family Aramidae. It is found mostly in wetlands in warm parts of the Americas, from Florida to northern Argentina. It feeds on molluscs, with the diet dominated by apple snails of the genus Pomacea. Its name derives from its seeming limp when it walks.
Limpkin

Steve Garvie [CC BY-NC-SA 2.0] via Flickr