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Biology > Gestational Periods in Animals

The table below shows the average gestational periods in mammals and incubation periods in birds. The figure in the right hand column is the period in whole days.

Animal Gestation Periods (days)
Ass 365
Baboon 187
Bear (black) 210
Bear (grizzly) 225
Bear (polar) 240
Beaver 122
Buffalo (American) 270
Camel (Bactrian) ~410
Cat (domestic) 58-65
Chimpanzee 230-250
Chinchilla 110-120
Chipmunk 31
Cow 279-292
Deer (white-tailed) 201
Dog (domestic) 58-70
Elephant (Asian) 645
Elk (Wapiti) 240-250
Fox (red) 52
Giraffe 420-450
Goat (domestic) 145-155
Gorilla 257
Guinea pig 68
Hippopotamus 225-250
Horse 330-342
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 (American) 12-13
Otter 270-300
Pig (domestic) 112-115
Porcupine 112
Puma 90
Rabbit (domestic) 30-35
Raccoon 63
Rhinoceros (black) 450
Seal 330
Sea lion ( California ) 350
Sheep (domestic) 144-151
Squirrel (grey) 30-40
Tiger 105-113
Whale (sperm) 480-500
Wolf 60-68
Zebra (Grant's) 365
Chicken 20-22
Duck 26-28
Finch 11-14
Goose 25-28
Parrot 17-31
Pheasant 24
Pigeon 10-18
Quail 21-23
Swan 33-36
Turkey 28