Provide a hypothesis about the length of gestation with respect to the animals involved. For example, the larger the typical litter, the shorter the gestation period.

Mammal	Approximate Length of Gestation
Mouse	19 days
Rabbit	31 days
Dog	61–63 days
Cat	63–65 days
Pig	112 days
Goat, pygmy	145 days
Goat	150 days
Deer	201 days
Human	266 days
Cow	284 days
Bison	285 days
Horse	330–340 days
Giraffe	457 days
Elephant, Asian	645 days