Plumage, a striking mix of black and white, shows much seasonal variation when found in the state. Oldsquaws may dive to 100 feet when foraging. They are uncommon spring and fall migrants through Pennsylvania. Occasionally they winter in the state, but more often along the coasts and on the Great Lakes. They breed in Canada, the Pacific Northwest and Alaska.
Buffleheads are fast fliers with rapid wing-beats.
They eat aquatic insects, snails, fish and other animal foods. Buffleheads are common spring-fall migrants, breeding in northern Canada and Alaska, and wintering along the coasts and in the southern states. Plumage is black and white on the male, brown and white on the female. Goldeneyes dive for crustaceans, insects, mollusks and fish. Common spring-fall migrants, they breed across Canada and in Alaska, and winter in Pennsylvania and across the continental United States.