A large loon with a black head, white back spots, and a pale yellow bill in breeding plumage. In Alaska it uses northern and western lakes in summer and nearshore waters in winter.
In breeding plumage it has a black head, white spots on the back, and a pale yellow bill. Outside the breeding season its plumage becomes brownish.
It feeds mainly on small fish, diving to catch them in deep, open water.
An extinction-risk assessment has not been added yet.