Mammal Gestation period Alpaca 335-366 [5][6] Baboon 187 Bear ( black ) 220 [7] Bear ( grizzly ) 215 Bear ( polar ) 241 Beaver 122 American Bison 217 Camel ( Bactrian ) 360-420 Cat ( domestic ) 5867, Average 64 Chimpanzee 230250 Chinchilla 105115 [8] Chipmunk 31 Cow 279292 Deer ( white-tailed ) 201 Dog ( domestic ) 5865, Average 61 Donkey 365 Elephant ( Asian ) 617 Elephant ( African ) 645 Elk ( Wapiti) 240250 European mink 38-76 [8] Ferret ( domestic) 41-42 [8] Fox ( red ) 52 Gerbil 22-26 [8] Giraffe 420450 Goat ( domestic ) 145155 Gorilla 255-260 Guinea pig 56-74 [8] Hamster 16-23 Hippopotamus 225250 Horse 330342 Human 266 Kangaroo 42 Leopard 9295 Lion 108 Llama 330 Mink 4075 Monkey ( rhesus ) 164 Moose 240250 Mouse ( domestic white) 19 Mouse ( meadow) 21 Muskrat 2830 Opossum ( Virginia) 1213 Otter 60-86 Pig ( domestic) 112115 Porcupine 210 Puma 90 Rabbit ( domestic ) 2835, Average 31-32 [8] Raccoon 63 Rat 21-23 [9] Rhinoceros ( black ) 450 Seal 330 Sea lion ( California ) 350 Sheep ( domestic ) 144151 Squirrel ( gray ) 3040 Tiger 105113 Whale ( sperm ) 480590 Wolf 6068 Wombat 2628 Zebra ( Grant's ) 361-390