Common Loon
Gavia immer

f6.3 @ 1/250s, ISO:1250, Nikon D300 w 500mm

"Great Northern Loon," Wikipedia, the free encyclopedia.Breeding adults have a black head, white underparts, and a checkered black-and-white mantle.The bill is black-blue and held horizontally. The bill colour and angle distinguish this species from the similar Yellow-billed Loon.
Kamloops, British Columbia Canada