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The true crows are large passerine birds that comprise the genus Corvus. Ranging in size from the relatively small pigeon-sized jackdaws (Eurasian and Daurian) to the Common Raven of the Holarctic region and Thick-billed Raven of the highlands of Ethiopia, the 40 or so members of this genus occur on all temperate continents (except South America) and several offshore and oceanic islands (including Hawai‘i).
In literary and fanciful usage, the collective noun for a group of crows, or at least the Carrion Crow, is a "murder." For a group of ravens, it is an "unkindess" However, in practice, most people, and especially scientists, use the more generic term flock or a "horde."