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For mammals the gestation period is the time in which a fetus develops, beginning with fertilization and ending at birth.[1] The duration of this period varies between species. Contents 1 Duration 1.1 Gestation periods 2 See also 3 References 4 Notes // Duration For most species, the amount a fetus grows before birth determines the length of the gestation period. Smaller species normally have a shorter gestation period than larger animals.[2] For example, a cat's gestation normally takes 58–65 days while an Elephant's takes 645 days.[3] However, growth does not necessarily determine the length of gestation for all species, especially for those with a breeding season. Species that use a breeding season usually give birth during a specific time of year when food is available.[2] Various other factors can come into play in determining the duration of gestation. For humans, male fetuses normally gestate several days longer than females and multiple pregnancies gestate for a shorter period.[2] Ethnicity may also lengthen or shorten gestation.[4] In dogs there's a positive correlation between gestation time and a small litter size. Gestation periods This section does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (April 2009) Mammal Gestation period (days) baboon 187 bear (black) 210 bear (grizzly) 225 bear (polar) 240 beaver 122 American Bison 270 camel (Bactrian) 410 cat (domestic) 58–67, Average 64 chimpanzee 230–250 chinchilla 105–115 [5] chipmunk 31 cow 279–292 deer (white-tailed) 201 dog (domestic) 58–65, Average 61 donkey 365 elephant (Asian) 616 elk (Wapiti) 240–250 European mink 38-76 [6] ferret (domestic) 41-42 [7] fox (red) 52 gerbil 22-26 [8] giraffe 420–450 goat (domestic) 145–155 gorilla 257 guinea pig 56-74 [9] hamster 15-18 [10] hippopotamus 225–250 horse 330–342 human 280 kangaroo 42 leopard 92–95 lion 108 llama 330 mink 40–75 monkey (rhesus) 164 moose 240–250 mouse (domestic white) 19 mouse (meadow) 21 muskrat 28–30 opossum (Virginia Opossum) 12–13 otter 270–300 pig (domestic) 112–115 porcupine 112 puma 90 rabbit (domestic) 28–35, Average 31-32 [12] raccoon 63 rat 9-20 [13] rhinoceros (black) 450 seal 330 sea lion (California) 350 sheep (domestic) 144–151 squirrel (gray) 30–40 tiger 105–113 whale (sperm) 480–590 wolf 60–68 wombat 26–28 zebra (Grant's) 365 See also mammalian pregnancy human pregnancy References Gestation, Incubation, and Longevity of Selected Animals David Crystal, The Cambridge Factfinder Cambridge: Cambridge University Press, 1998 (84). Notes ^ "Gestation period". McGraw-Hill's AccessScience Encyclopedia of Science & Technology Online. McGraw-Hill. http://www.accessscience.com/abstract.aspx?id=288400&referURL=http%3a%2f%2fwww.accessscience.com%2fcontent.aspx%3fid%3d288400.  ^ a b c "gestation". Britannica - The Online Encyclopedia. Encyclopedia Britannica. http://www.britannica.com/EBchecked/topic/232124/gestation.  ^ "Average Animal Gestation Periods and Incubation Times". MSN Encarta. Microsoft. Archived from the original on 2009-10-31. http://www.webcitation.org/5kwpsKDKF.  ^ "Does gestation vary by ethnic group? A London-based study of over 122000 pregnancies with spontaneous onset of labour". International Journal of Epidemiology. http://ije.oxfordjournals.org/cgi/content/full/33/1/107.  ^ Anamnese en lichamelijk onderzoek bij gezelschapsdieren, A.Rijnberk, F.J.van Sluis, 2nd print, Bohn Stafleu van Loghum, 2005, (Current Dutch veterinary examination study book for small domestic mammals) ^ Anamnese en lichamelijk onderzoek bij gezelschapsdieren, A.Rijnberk, F.J.van Sluis, 2nd print, Bohn Stafleu van Loghum, 2005, (Current Dutch veterinary examination study book for small domestic mammals) ^ Anamnese en lichamelijk onderzoek bij gezelschapsdieren, A.Rijnberk, F.J.van Sluis, 2nd print, Bohn Stafleu van Loghum, 2005, (Current Dutch veterinary examination study book for small domestic mammals) ^ Anamnese en lichamelijk onderzoek bij gezelschapsdieren, A.Rijnberk, F.J.van Sluis, 2nd print, Bohn Stafleu van Loghum, 2005, (Current Dutch veterinary examination study book for small domestic mammals) ^ Anamnese en lichamelijk onderzoek bij gezelschapsdieren, A.Rijnberk, F.J.van Sluis, 2nd print, Bohn Stafleu van Loghum, 2005, (Current Dutch veterinary examination study book for small domestic mammals) ^ Anamnese en lichamelijk onderzoek bij gezelschapsdieren, A.Rijnberk, F.J.van Sluis, 2nd print, Bohn Stafleu van Loghum, 2005, (Current Dutch veterinary examination study book for small domestic mammals) ^ Anamnese en lichamelijk onderzoek bij gezelschapsdieren, A.Rijnberk, F.J.van Sluis, 2nd print, Bohn Stafleu van Loghum, 2005, (Current Dutch veterinary examination study book for small domestic mammals) ^ Anamnese en lichamelijk onderzoek bij gezelschapsdieren, A.Rijnberk, F.J.van Sluis, 2nd print, Bohn Stafleu van Loghum, 2005, (Current Dutch veterinary examination study book for small domestic mammals) ^ Anamnese en lichamelijk onderzoek bij gezelschapsdieren, A.Rijnberk, F.J.van Sluis, 2nd print, Bohn Stafleu van Loghum, 2005, (Current Dutch veterinary examination study book for small domestic mammals) This developmental biology article is a stub. 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