E. carolinus E. cyanocephalus E. magnirostris Euphagus is a small genus of American blackbirds.

Adult males have mainly black plumage and a bright yellow eye; females are dark gray-brown.

A prehistoric relative, Euphagus magnirostris, is known from Late Pleistocene fossils found in the famous tar seeps of Rancho La Brea, California, as well as the Talara Tar Seeps of northwestern Peru and the Mene de Inciarte Tar Seep of Venezuela.

[3][4] Both are migratory, wintering in the southern United States and Mexico, although some Brewer's blackbirds are present all year in the western US.

The fortunes of the two species are contrasting, with Brewer's expanding east in the Great Lakes region, while rusty shows a worrying decline in numbers.