They have, however, been found to subsist on either animal or vegetable substances. Reproduction The birthing season for this species begins in December and ends in January. The age of sexual maturity is 4-4.5 years old in males and 3 years in females. They are annual breeders, and they have short interbirth intervals. This interval may be less than twelve months.
Receptive females attract males with conspicuous postures and facial expressions.
The gestation period of the female patas monkey has been estimated at 170 days. However, it is difficult to know the exact gestation period because the females show no external signs of estrus. Also, females in captivity can go through postconception estrus. Therefore, it is difficult to reliably estimate wild patas monkeys gestation periods based on captive specimans. Females give birth to a single young.