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The common raven (Corvus corax) is a large, all-black passerine bird and the most widely distributed of all corvids. Averaging 63 centimetres (25 inches) in length and 1.2 kilograms (2.6 pounds) in weight, these intelligent birds can live up to 21 years in the wild. They are commonly found in mythology, folklore, art, and literature.Photograph: David Iliff