Genus
Castor Linnaeus, 1758
List of species
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Infraphylum | Gnathostomata |
| Superclass | Tetrapoda |
| Class | Mammalia |
| Order | Rodentia |
| Family | Castoridae |
| Genus | Castor |
| Species | fiber |