Class [Mammalia] Linnaeus, 1758 - mammals Order Rodentia Bowdich, 1821 - rodents Family Castoridae Batsch, 1788 - beavers Genus Castor Linnaeus, 1758 - beavers 1 Castor canadensis Kuhl, 1820 - American beaver 2 Castor fiber Linnaeus, 1758 - Eurasian beaver