Black-throated Loon

The adult black-throated loon is 58–73 centimetres long with a wingspan of 100–130 centimetres, weighing 1.3–3.4 kilograms. In breeding plumage the nominate subspecies has a grey head and hindneck with a black throat and a large black patch on the foreneck, both with a soft purple gloss. A necklace-shaped patch of short parallel white lines marks the lower throat, and about five long parallel white lines run from the side of that patch down to the chest, which also carries a pattern of white and black lines. (Wikipedia, general species account)

Also known as the Arctic loon or black-throated diver, it is a migratory aquatic bird of the Northern Hemisphere, breeding mainly on freshwater lakes in northern Europe and Asia. It winters along sheltered, ice-free coasts of the northeast Atlantic and the eastern and western Pacific. Carl Linnaeus described it in 1758, and two subspecies are recognised. It was previously considered the same species as the Pacific loon, its traditional sister species, though this is debated. (Wikipedia, general species account)