The red-breasted merganser (Mergus serrator) belongs to the sawbill family, so called because of their long, serrated bills, used for catching fish. The adult male in breeding plumage has a reddish-brown mottled breast, white neck collar, green head, and red eyes. The serrate orange bill is very thin. The female has an overall grey body, reddish-brown head, and reddish eyes. It breeds in freshwater lakes and rivers across northern North America, Greenland, Europe, and Asia.
