* Kingdom: Animalia (animals)
* Phylum: Chordata (animals with a notochord)
* Class: Mammalia (mammals)
* Order: Rodentia (rodents)
* Family: Castoridae (beavers)
* Genus: Castor
* Species:
* North American Beaver: *Castor canadensis*
* Eurasian Beaver: *Castor fiber*
So, while beavers belong to the *Castoridae* family, there are only two species of beavers recognized by scientists: the North American beaver and the Eurasian beaver.