The Black-throated Loon is a migratory aquatic bird found in the northern hemisphere. The species is known as an Arctic Loon in North America and the Black-throated Diver in Eurasia. Its current name is a compromise proposed by the International Ornithological Committee.The Black-throated Loon was one of the many species originally described by Linnaeus in his 18th century work, Systema Naturae.The genus name Gavia comes from the Latin for "sea mew", as used by ancient Roman naturalist Pliny the Elder.Breeding adults are 58 to 77 cm (23 to 30 in) in length with a 100 to 130 cm (39 to 51 in) wingspan, shaped like a smaller, sleeker version of the Great Northern Diver. Body mass is reportedly from 2–3.4 kg (4.4–7.5 lb). They have a grey head, black throat, white underparts and chequered black-and-white mantle.
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