Castoridae
| Castoridae Temporal range:  | |
|---|---|
| North American beaver, Castor canadensis | |
| Scientific classification | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Chordata | 
| Class: | Mammalia | 
| Order: | Rodentia | 
| Superfamily: | Castoroidea | 
| Family: | Castoridae Hemprich, 1820 | 
| Type genus | |
| Castor Linnaeus, 1758 | |
| Genera | |
| See text | |
Castoridae is a family of rodents that contains the two living species of beavers and their fossil relatives. A formerly diverse group, only a single genus is extant today, Castor. Two other genera of "giant beavers", Castoroides and Trogontherium, became extinct in the Late Pleistocene.