Aplodontia rufa (mountain beaver, sewellel, boomer)
| Class | Mammalia |
| Order | Rodentia |
| Family | Aplodontiidae |
| Genus | Aplodontia |
| Species | Aplodontia rufa |
| Common | mountain beaver, sewellel, boomer |
| Diet | herbivore (including ferns, fir, rhododendron), coprophagic |
| Habitat | forests of the Pacific Northwest, near water |
| Description | Rabbit-sized, brown. Short ears,and legs, very short tail, white spot below ear. |
| Skull Characteristics | Protrogomorphous. Flattened skull, flask shaped auditory bulla, lateral projection on teeth (apple-shaped). |
| Notes | Link to more species information: |