(Castor canadensis) and the Eurasian beaver (C. fiber). The Eurasian beaver is slightly longer and has a more lengthened skull, triangular nasal cavities (as opposed to the square ones of the North American species), a lighter fur color, and a narrower tail.

Evolution

Beavers belong to the rodent suborder Castorimorpha, along with Heteromyidae (kangaroo rats

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