Habitat: Marshes of fresh water, pools, rivers, lagoons and lakes. This species can be found in pratically any aquatic habitats. Distribution: This species breeds in North America and during winter it migrates from southern United States to Central Argentina, Uruguay and Panama. Natural History Notes: Conservation status according to IUCN 2008 Red list: Least Concern (LC) Characteristics: This species has a gray beak. The Male has a head and an upper neck dark gray (blacker on the crown) and shows a prominent white crescent on the forepart of the face. Otherwise, the male is mostly blackish above and brownish below. The female is mottled light brown. In flight, both sexes show prominent pale blue wing-coverts (may look white at a distance) and a green speculum.