Short gestation periods:
* House mouse: 19-21 days
* Hamster: 15-18 days
* Rabbit: 30-32 days
* Guinea pig: 59-72 days
* Dog: 58-67 days
Medium gestation periods:
* Cat: 58-67 days
* Sheep: 147-152 days
* Goat: 145-152 days
* Pig: 112-115 days
Long gestation periods:
* Horse: 330-345 days
* Cow: 283 days
* Elephant: 22 months (640-660 days)
* Giraffe: 14-15 months (450-460 days)
Factors influencing gestation period:
* Species: This is the most significant factor.
* Breed: Within a species, different breeds can have slightly different gestation periods.
* Individual factors: The health and age of the mother can also play a role.
* Environmental factors: Stress, nutrition, and temperature can influence gestation length.
It's important to note that these are just averages. There can be significant variation within each species, and individual animals may have longer or shorter gestation periods than the norm.