This chart shows gestational or incubation duration in days by gestational age. Gestational age is the age of an embryo or fetus (or newborn infant)
14 years ago
| Animal | Gestation or incubation, in days (average) |
|---|---|
| Ass | 365 |
| Bear | 180–240 |
| Cat | 52–69 |
| Chicken | 22 |
| Cow | 280 |
| Deer | 197–300 |
| Dog | 53–71 |
| Duck | 21–35 |
| Elephant | 510–730 |
| Fox | 51–63 |
| Goat | 136–160 |
| Groundhog | 31–32 |
| Guinea pig | 58–75 |
| Hamster, golden | 15–17 |
| Hippopotamus | 220–255 |
| Horse | 329–345 |
| Human | 253–303 |
| Kangaroo | 32–39 |
| Lion | 105–113 |
| Monkey | 139–270 |
| Mouse | 19–31 |
| Parakeet (Budgerigar) | 17–20 |
| Pig | 101–130 |
| Pigeon | 11–19 |
| Rabbit | 30–35 |
| Rat | 21 |
| Sheep | 144–152 |
| Squirrel | 44 |
| Whale | 365–547 |
| Wolf | 60–63 |