A small duck of shallow ponds and wetlands in North America. Breeding males have blue-grey heads; females and nonbreeding males are patterned brown.
Breeding males have a blue-grey head with a white crescent in front of the eye. Females and eclipse males are brown; all plumages show a blue patch on the wing in flight.
It feeds in shallow water by dabbling, sometimes submerging its head or tipping up for aquatic plants and small animals. It migrates south from North America, with some birds reaching South America.
An extinction-risk assessment has not been added yet.