Crows are generally smaller and not as thick-billed as ravens, which belong to the same genus. A large majority of the 40 or so Corvus species are known as crows, and the name has been applied to other, unrelated birds. Large crows measure about 0.5 meter (20 inches) long, with wingspans that can reach 1 meter (39 inches).

A crow is a bird of the genus Corvus, or more broadly a synonym for all of Corvus. The term "crow" is used as part of the common name of many species.

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