The members of the crow family (Corvidae) are among the world's most intelligent birds. The family has recently undergone taxonomic expansion, brought about by evidence gathered through genetic testing, and now includes such diverse species as birds-of-paradise, orioles, and drongos. Crows and jays belong to the subfamily Corvinae. The corvids comprise 113 species in 25 genera, which include ravens, crows, jays, magpies, rooks, nutcrackers, and jackdaws. Corvids are passerine or perching birds and count among their numbers the largest of the passerines. Corvids vary considerably in size, ranging from the tiny Hume's ground jay, which is 7.5 in (19 cm) long and weighs 1.5 oz (45 g), to the thick-billed raven, which is 25 in (64 cm) long and weighs 53 oz (1.5 kg).

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