* Chimpanzees: 225-237 days (approximately 7.5-8 months)
* Gorillas: 250-270 days (approximately 8-9 months)
* Orangutans: 230-260 days (approximately 7.5-8.5 months)
* Macaques: 146-186 days (approximately 5-6 months)
* Marmosets: 140-150 days (approximately 4.5-5 months)
Factors that can influence gestational period:
* Species: Different monkey species have different gestation lengths.
* Individual variation: Even within the same species, there can be slight variations in gestation length.
* Environmental factors: Factors such as diet and climate can also play a role.
It's important to note that these are just general ranges, and the actual gestation period for a specific monkey can vary.