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The crow (Corvidae) is a large family of birds that includes jackdows, choughs, JAYS, MAGPIES and nutcrackers as well as crows and RAVENS. The crow family represents one of the most advanced stages of avian evolution, showing, for example, a highly developed intelligence and a complex social organization. The family is thought to have originated during the middle of the Miocene period (23.7 to 4.9 million years ago) in the Old World. Jays are believed to be the most primitive members of the Corvidae. From this group, magpies and, later, ravens and typical crows evolved. At present, 118 species of Corvidae are recognized.


Keywords
Birds

Crows and ravens are the largest members of the order Passeriformes (perching birds). Their range in length is 17.5-70 cm. The typical crow (genus Corvus) is either wholly black (including bill and legs) or black with white, grey and brown.

Of the 3 species of Corvus native to Canada, only the northwestern crow (C. caurinus) has a limited range. It inhabits the coast and islands of BC, where it forages along shores, beaches and tidal flats. The highly adaptable American crow (C. brachyrhynchos) occupies many habitats and feeds on both animal and vegetable matter. It breeds from north-central BC to Newfoundland. Similarly, the common raven (C. corax) is found in most of Canada.

Both northwestern and American crows tend to forage in open areas but prefer wooded habitats for nesting and roosting. The northwestern crow nests mainly in coniferous trees; the American crow, in deciduous and coniferous trees and, occasionally, in low bushes. The male American crow helps incubate the clutches of 4-6 eggs.

In places, crows have proven more harmful than helpful to humans, since although they kill a large number of insects, they also damage CROPS, particularly corn. They also prey on eggs and young of many desirable birds.


Crow, American
The highly adaptable American crow occupies many habitats and feeds on both animal and vegetable matter (Macmillan Illustrated Animal Encyclopedia).

Crow Distribution

Author LORRAINE G. D'AGINCOURT


Links to Other Sites
Canadian Biodiversity Website
A great information source for all budding biologists. Learn about biodiversity theory, natural history, and conservation issues. From McGill’s Redpath Museum.

American Crow
An illustrated life history of the American crow from Environment Canada's WILDSPACE website.

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