Formerly a nonmigratory subspecies of Mallard, the Mottled Duck is a resident of fresh and saltwater wetlands in the southeastern United States and eastern Mexico. Male and female Mottled Ducks are virtually identical, both are a dark, mottled-brown color overall, with a greenish-blue speculum, and an olive-yellow bill. Mottled Ducks are generalist foragers, feeding on aquatic plants, terrestrial and aquatic invertebrates, and even occasionally feeding on amphibians and small fish. A significant threat to this species in Mexico is hybridization with other species in its genus, especially the Mexican Duck subspecies of the Mallard. Due to its relatively small global population of less than 200,000 individuals, the Mottled Duck is particularly vulnerable to habitat loss and other pressures.