AnAge entry for Ursus arctos
Classification (HAGRID: 02252)
- Taxonomy
-
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia (Taxon entry)
Order: Carnivora
Family: Ursidae
Genus: Ursus
- Species
- Ursus arctos
- Common name
- Brown bear
Lifespan, ageing, and relevant traits
- Maximum longevity
- 40 years (captivity)
- Source
- ref. 671
- Sample size
- Large
- Data quality
- Acceptable
- Observations
The implantation of the fertilized eggs is usually delayed for about 4 months. It has been suggested that these animals may live up to 50 years [0434], which is doubtful. These are common animals in zoos, and so far record longevity in captivity is about 40 years for one wild born female [0671]. An aged specimen had neurofibrillary tangles [0955].
Life history traits (averages)
- Female sexual maturity
- 1,313 days
- Male sexual maturity
- 1,313 days
- Gestation
- 103 days
- Weaning
- 213 days
- Litter size
- 2 (viviparous)
- Litters per year
- 0.4
- Inter-litter interval
- 852 days
- Weight at birth
- 510 g
- Weight at weaning
- 26,000 g
- Adult weight
- 277,500 g
- Postnatal growth rate
- Maximum longevity residual
- 120%
Metabolism
- Typical body temperature
- 310ºK or 37.3ºC or 99.1ºF
- Basal metabolic rate
- Not yet available
References
- [1143] Nussey et al. (2013), Senescence in natural populations of animals: widespread evidence and its implications for bio-gerontology (PubMed)
- [0671] Richard Weigl (2005), Longevity of Mammals in Captivity; from the Living Collections of the World
- [0610] Ernest (2003), Life history characteristics of placental non-volant mammals
- [0434] Ronald Nowak (1999), Walker's Mammals of the World
- [0997] Hissa et al. (1994), Seasonal patterns in the physiology of the European brown bear (Ursus arctos arctos) in Finland (PubMed)
- [0455] Virginia Hayssen et al. (1993), Asdell's Patterns of Mammalian Reproduction: A Compendium of Species-Specific Data
- [0955] Cork et al. (1988), Neurofibrillary tangles and senile plaques in aged bears (PubMed)
- [0680] Wootton (1987), The effects of body mass, phylogeny, habitat, and trophic level on mammalian age at first reproduction
External Resources
- Integrated Taxonomic Information System
- ITIS 180543
- Animal Diversity Web
- ADW account
- Encyclopaedia of Life
- Search EOL
- NCBI Taxonomy
- Taxonomy ID 9644
- Entrez
- Search all databases
- Ageing Literature
- Search Google Scholar or Search PubMed
- Images
- Google Image search
- Internet
- Search Google