🐭Mountain beaver
The mountain beaver or sewellel is a North American rodent. It is the only living member of its genus, Aplodontia, and family, Aplodontiidae. It should not be confused with true North American and Eurasian beavers, to which it is not closely related; the mountain beaver is instead more closely related to squirrels. There are seven subspecies of mountain beaver, six of which are found in California and three of which are endemic to the state.
Text: Wikipedia, CC BY-SA 4.0.
IUCN Red List assessment, 2016.
- Body mass
- 0.71 kg
- Body length
- 0.38 m
- Shoulder height
- not recorded
- Top speed
- not recorded
- Bite force
- not recorded
- Maximum lifespan
- 9.99 years
Everything we know about the Mountain beaver
Typical adult figures. Where a value is an estimate rather than a measurement, it says so.
Body mass0.71 kgCOMBINEOther figures ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Figures vary
- 1.13 kgAnAgeAnAge build 15, 2023-07-03 (HAGR)data quality: low
Body length0.38 mCOMBINEDetails ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Brain mass6.45 gCOMBINEDetails ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Maximum lifespan9.99 yearsCOMBINEDetails ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Generation length4.32 yearsCOMBINEDetails ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Age at maturity2.3 yearsCOMBINEDetails ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Gestation30 daysCOMBINEOther figures ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Figures vary
- 29 daysAnAgeAnAge build 15, 2023-07-03 (HAGR)data quality: low
Litter sizeabout 3COMBINEOther figures ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Figures vary
- 2.75AnAgeAnAge build 15, 2023-07-03 (HAGR)data quality: low
Trophic levelHerbivoreCOMBINEDetails ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Activity cycleCrepuscular / mixedCOMBINEDetails ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Home range0 km²COMBINEDetails ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Population density778 per km²COMBINEDetails ↓Hide ↑
Source: COMBINE · v1 (Soria et al. 2021) · CC BY 4.0
Volume l0.7 LaverageDetails ↓Hide ↑
Body mass at ~1.0 kg/L, the density of vertebrate tissue.
average = a mean across sexes or species in a group.
Not recorded for Mountain beaver yet: shoulder height, top speed, bite force.
Family tree
- kingdomAnimalia
- ›phylumChordata
- ›classMammalia
- ›orderRodentia
- ›familyAplodontiidae
- ›genusAplodontia
- ›speciesAplodontia rufa
- classMammals · Mammalia
- orderRodents · Rodentia
- familyAplodontiidae
- genusAplodontia
All 14 branches ↓Fewer branches ↑
- kingdomMetazoa
- phylumChordata
- subphylumCraniata
- subphylumVertebrata
- superclassGnathostomata
- superclassSarcopterygii
- superclassTetrapoda
- classMammals · Mammalia
- subclassTheria
- superorderEuarchontoglires
- orderRodents · Rodentia
- suborderSciuromorpha
- familyAplodontiidae
- genusAplodontia
More about the Mountain beaver
No videos of the Mountain beaver yet.
We have 44,653 videos so far, and none of them features this animal yet.
All videos →Compare the Mountain beaver
Pick a tool — the Mountain beaver is already selected.
Compare every stat with any other animal.
Stand them on the same floor and see who's bigger.
How speed, brain and bite scale with body size. This animal isn't in the sample yet.
See where it sits in the tree of life.