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| Classification (HAGRID: 02601) | |
| Taxonomy | Kingdom: Animalia Phylum: Chordata Class: Mammalia (Taxon entry) Order: Carnivora Family: Ursidae Genus: Ursus |
| Species | Ursus arctos |
| Common name | Brown bear and grizzly 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]. |
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 | |
| No information on metabolism available. | |
References |
|
[0671] Richard Weigl (2005), Longevity of Mammals in Captivity; from the Living Collections of the World | |
External resources | |
| Integrated Taxonomic Information System | ITIS 180543 |
| Animal Diversity Web | ADW account |
| Encyclopedia of Life | Search EOL |
| Genome Project | Search NCBI |
| Entrez | |
| Ageing literature | |
| Images | Google Image search |
| Internet | Search Google |
If you find any missing or incorrect data, please contact us.