Animal World - All about CROW around the world

Crows form the genus Corvus in the family Corvidae. Ranging in size from the relatively small pigeon-size 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 (except for a few, which included Hawaii, which had the Hawaiian crow that went extinct in the wild in 2002). In the United States and Canada, the word "crow" is used to refer to the American Crow, Corvus brachyrhynchos.

The crow genus makes up a third of the species in the Corvidae family. Crows appear to have evolved in Asia from the corvid stock, which had evolved in Australia. A group of crows is called a flock or, more poetically, a murder, But the term “murder of crows” mostly reflects a time when groupings of many animals had colorful and poetic names. For example, other “group” names include: an ostentation of peacocks, a parliament of owls, a knot of frogs, and a skulk of foxes.

Recent research has found some crow species capable not only of tool use but of tool construction as well. Crows are now considered to be among the world's most intelligent animals. The Jackdaw and the European Magpie have been found to have a neostriatum approximately the same relative size as is found in chimpanzees and humans, and significantly larger than is found in the gibbon.

Corvus species are all black or black with little white or gray plumage. They are stout with strong bills and legs. The sexes are not very different in appearance.