Gestational Duration By Species
The following table shows gestational or incubation duration in days by gestational age (from last menstrual period)
| Species/group | Range | On average | Reference for average range |
|---|---|---|---|
| Donkey | 365 | ||
| Bear | 180–240 | ||
| Cat | 52–69 | 63 | |
| Chicken | 22 | ||
| Cow | 280 | ||
| Deer | 197–300 | ||
| Dog | 53–71 | 63 | |
| Duck | 21–35 | 28 | |
| Elephant | 510–730 | 624 | |
| Fox | 51–63 | ||
| Goat | 136–160 | 151 | |
| Groundhog | 31–32 | ||
| Guinea pig | 58–75 | 68 | |
| Hamster, golden | 15–17 | ||
| Hippopotamus | 220–255 | 240 | |
| Horse | 329–345 | 336 | |
| Human | 253–303 | ||
| Kangaroo | 32–39 | ||
| Lion | 105–113 | 108 | |
| Monkey | 139–270 | ||
| Mouse | 19–31 | ||
| Pig | 101–130 | 115 | |
| Rabbit | 30–35 | 31 | |
| Rat | 21 | ||
| Sheep | 144–152 | 151 | |
| Squirrel | 44 | ||
| Whale | 365–547 | ||
| Wolf | 60–63 |
Read more about this topic: Pregnancy (mammals)
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“Genius detects through the fly, through the caterpillar, through the grub, through the egg, the constant individual; through countless individuals the fixed species; through many species the genus; through all genera the steadfast type; through all the kingdoms of organized life the eternal unity. Nature is a mutable cloud which is always and never the same.”
—Ralph Waldo Emerson (1803–1882)