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Approximate Gestation Periods

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Species	Days, Except Where Noted
Domestic Animals
Cat	65
Cattle	9 months
Dog	62–64^a
Donkey	365
Goat	150
Horse	11 months
Llama, alpaca	11.5 months
Pig	114
Rabbit	31
Sheep	150

Wild Animals
Bear (black)	210
Bison	280
Camel	365–400
Chimpanzee	236
Coyote	63
Deer (mule and white-tailed)	200
Elephant	660
Elk, wapiti	255
Giraffe	425
Gorilla	270
Hare	36
Hippopotamus	240
Leopard	95
Lion	108
Marmoset	150
Monkey (macaque)	180
Moose	235
Muskox	255
Muskrat	29
Nutria, coypu	130
Opossum	12
Otter (river)	9.5–12.5 months^b
Panther	90
Porcupine	210
Pronghorn	250
Raccoon	63
Reindeer	225
Rhinoceros (African)	480
Seal	330
Shrew	20
Skunk	63
Squirrel (gray)	40
Tapir	390
Tiger	103
Walrus	450
Whale	450
Woodchuck	31
Wolf	63

Farmed Fur Animals
Chinchilla	111
Ferret	42
Fox	52
Mink
– European	41
– American	40–75
See also the table "Select Physiological Data of Laboratory Animals" in the topic Colony Monitoring of Laboratory Animals.
^a Gestation period is 58–72 d from breeding at unknown stage of estrus; from day of ovulation (which can be determined by progesterone or luteinizing hormone monitoring), gestation period is 62–64 d.
^bIncludes a delayed implantation period of 7.5–10.5 mo.