About Gavia adamsii (G.R.Gray, 1859)
The yellow-billed loon, scientifically named Gavia adamsii (G.R.Gray, 1859), is the largest member of the loon (diver) family. It measures 76 to 97 cm (30 to 38 in) in length, has a wingspan of 135 to 160 cm (53 to 63 in), and weighs between 4 and 6.4 kg (8.8 to 14.1 lb). Adult yellow-billed loons in breeding plumage are mainly black and white, with a purple gloss on the head and neck. A 1986 publication by Appleby, R.H., Madge, S.C., and Mullarney, Killian covers the identification of immature and winter plumage divers in volume 79, issue 8 of British Birds, on pages 365–391. The yellow-billed loon is an Arctic species. It breeds mainly along Arctic Ocean coasts as far north as 78° N, and has been recorded as a breeding bird in Russia, Canada, and the United States. It winters on sheltered coastal waters of the northern Pacific Ocean and the northwestern coast of Norway. While it mostly winters north of 50° N, its winter range extends south to 35° N off the coast of Japan. It has been recorded as a vagrant in over 20 countries, including locations as far south as Mexico and Spain.
