Mammal Gestation period (days)
Alpaca 335-366
Baboon 187
Bear ( black ) 220 [7]
Bear ( grizzly ) 215
Bear ( polar ) 241
Beaver 122
American Bison 217
Camel ( Bactrian ) 360-420
Cat ( domestic ) 58–67, Average 64
Chimpanzee 230–250
Chinchilla 105–115 [8]
Chipmunk 31
Cow 279–292
Deer ( white-tailed ) 201
Dog ( domestic ) 58–65, Average 61
Donkey 365
Walrus 456
Elephant ( Asian ) 617
Elephant ( African) 645
Elk ( Wapiti) 240–250
European mink 38-76 [8]
Ferret ( domestic ) 41-42 [8]
Fox ( red) 52
Gerbil 22-26 [8]
Giraffe 420–450
Goat ( domestic ) 145–155
Gorilla 255-260
Guinea pig 56-74 [8]
Hamster 16-23
Hippopotamus 225–250
Horse 330–342
Human 259-280
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) 12–13
Otter 60-86
Pig ( domestic ) 112–115
Porcupine 210
Puma 90
Rabbit ( domestic ) 28–35, Average 31-32 [8]
Raccoon 63
Rat 21-23 [9]
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 ) 361-390
Source: wikipedia
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