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Only animals from the classes of the Chordata phylum are included. [1] On average, captive animals (especially mammals ) live longer than wild animals. This may be due to the fact that with proper treatment , captivity can provide refuge against diseases , competition with others of the same species and predators .
The definition of "longest-living" used in this article considers only the observed or estimated length of an individual organism's natural lifespan – that is, the duration of time between its birth or conception, or the earliest emergence of its identity as an individual organism, and its death – and does not consider other conceivable ...
Gestation, Incubation, and Longevity of Selected Animals; David Crystal, The Cambridge Factfinder Cambridge: Cambridge University Press, 1998 (84). Online animal encyclopedia; Study finds wide range in pregnancy length; van Aarde, Rudi J. (1984). "Aardvark". In Macdonald, David (ed.). The Encyclopedia of Mammals. New York, NY: Facts on File ...
Twinning, or, having two babies per pregnancy, is extremely rare in elephants. Elephant gestations result in twins about 1% of the time. Unfortunately, even when both calves survive birth, both ...
Greenland sharks are currently the vertebrate species with the longest known lifespan. [47] An examination of 28 specimens in one study published in 2016 determined by radiocarbon dating that the oldest of the animals that they sampled had lived for about 392 ± 120 years (a minimum of 272 years and a maximum of 512 years). The authors further ...
Colo was held at the Columbus Zoo and has been there longer than any other animal in the zoo's captive animal collection. Colo and her progeny, five of whom are still held at the Columbus Zoo, comprised about one-third of the Zoo's 17 captive gorillas as of 2015.
The most intricate example of maternal care in this group can be seen in crocodilian species, as mothers may stay with their young for multiple months. [16] The general mammalian tendency for female parents to invest more in offspring was focused on in the development of early hypotheses to describe sex differences in paternal care.
The kitten was initially not expected to live beyond a few days, as janus animals usually die within that time-frame. Veterinary nurse Martha "Marty" Stevens took the kitten home to care for it anyway and ended up tube-feeding him for 3 months. Frank and Louie eventually learned to eat on his own and "thrived". [3]