AnAge entry for Odobenus rosmarus
Classification (HAGRID: 02207)
- Taxonomy
-
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia (Taxon entry)
Order: Carnivora
Family: Odobenidae
Genus: Odobenus
- Species
- Odobenus rosmarus
- Common name
- Walrus
- Synonyms
- Phoca rosmarus, Rosmarus arcticus
Lifespan, ageing, and relevant traits
- Maximum longevity
- Not yet established
- Observations
In the wild, walrus have been estimated to live over 40 years [0542]. Their longevity in captivity has not been studied in detail and hence information on ageing is limited. One wild born specimen was about 30.6 years old when it died in captivity [0671]. Atherosclerosis was described in a 25 year-old captive animal [0555].
Life history traits (averages)
- Female sexual maturity
- 1,745 days
- Male sexual maturity
- 2,635 days
- Gestation
- 331 days
- Weaning
- 730 days
- Litter size
- 1 (viviparous)
- Litters per year
- 0.5
- Inter-litter interval
- 834 days
- Weight at birth
- 60,000 g
- Weight at weaning
- 200,000 g
- Adult weight
- 1,012,500 g
- Postnatal growth rate
- 0.0009 days-1 (from Gompertz function)
Metabolism
No information on metabolism is available.
References
- [0671] Richard Weigl (2005), Longevity of Mammals in Captivity; from the Living Collections of the World
- [0443] Ronald Nowak (2003), Walker's Marine Mammals of the World
- [0610] Ernest (2003), Life history characteristics of placental non-volant mammals
- [0555] Gruber et al. (2002), Atherosclerosis with multifocal myocardial infarction in a Pacific walrus (Odobenus rosmarus divergens Illiger) (PubMed)
- [0434] Ronald Nowak (1999), Walker's Mammals of the World
- [0538] Don Wilson and Sue Ruff (1999), The Smithsonian Book of North American Mammals
- [0441] William Burt et al. (1998), A Field Guide to Mammals
- [0455] Virginia Hayssen et al. (1993), Asdell's Patterns of Mammalian Reproduction: A Compendium of Species-Specific Data
- [0542] Bernhard Grzimek (1990), Grzimek's Encyclopedia of Mammals
- [0680] Wootton (1987), The effects of body mass, phylogeny, habitat, and trophic level on mammalian age at first reproduction
- [0573] David Macdonald (1985), The Encyclopedia of Mammals
- [0731] Zullinger et al. (1984), Fitting sigmoid equations to mammalian growth curves
External Resources
- Integrated Taxonomic Information System
- ITIS 180639
- Animal Diversity Web
- ADW account
- Encyclopaedia of Life
- Search EOL
- NCBI Taxonomy
- Taxonomy ID 9707
- Entrez
- Search all databases
- Ageing Literature
- Search Google Scholar or Search PubMed
- Images
- Google Image search
- Internet
- Search Google