AnAge entry for Mirounga angustirostris

Classification (HAGRID: 02576)
Taxonomy	Kingdom: Animalia Phylum: Chordata Class: Mammalia (Taxon entry) Order: Carnivora Family: Phocidae Genus: Mirounga
Species	Mirounga angustirostris
Common name	Northern elephant seal
Lifespan, ageing, and relevant traits
Maximum longevity	Not yet established
Observations	The total gestation time is about 11 months and includes a 2-3 months period of delayed implantation [0443]. Not much is known about the longevity of this species. In the wild, it is estimated that females live up to 18-20 years [0538]. One wild born specimen was about 15.8 years of age when it died in captivity [0671].
Life history traits (averages)
Female sexual maturity	1,095 days
Male sexual maturity	1,826 days
Gestation	252 days
Weaning	26 days
Litter size	1 (viviparous)
Litters per year	1
Inter-litter interval	365 days
Weight at birth	37,500 g
Weight at weaning	140,315 g
Adult weight	1,600,000 g
Postnatal growth rate
Metabolism
No information on metabolism 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 [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
External resources
Integrated Taxonomic Information System	ITIS 180672
Animal Diversity Web	ADW account
Encyclopedia of Life	Search EOL
Genome Project	Search NCBI
Entrez	Search all databases Entrez Taxonomy search
Ageing literature	Search Google Scholar Search PubMed Search Scirus
Images	Google Image search
Internet	Search Google

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