Location in Oregon
Blue is Winter range - Red is Summer range
Purple is Year-round range - Yellow is Migration range

Black-crowned Night-Heron

Nyctiocorax Nyctiocorax - Night-herons are characterized by heavy bodies, short thick necks, and, in this species, short legs. A common heron of fresh-water swamps and tidal marshes, The adult is dark-backed and entirely white below. Flies in loose flocks. Often inactive by day, roosting in trees. Fishes more at night. Call, a single kwawk, is most frequently heard at night.