Description
This species plumage is virtually identical to American Crow. A percentage may be distinguished by in-hand criteria such as smaller wing chord and tail length, shorter tarsus, and smaller bill. Percentages increase when sex of animal is known. Like the American Crow, the sexes look the same. Older birds in breeding condition may be reliably sexed by in-hand criteria such as cloacal protuberance (male) or by brood patch (female). Younger birds may not attain breeding condition as they assist at the nest.
Read more about this topic: Northwestern Crow
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