At Monkey Jungle, January and February is the time of year when the girls and the guys get together because it s the breeding season. This fattened condition results from a surge in the male s hormones. Once the breeding season ends, the males loose their added weight and size, shrinking back down to their normal size. The females kick the males out of their group and go on to bear their young. By the way, if you are wondering how to tell who is male and who is female, look at the tops of the heads.
Females have black fur on their heads.
Males, on the other hand, have just gray fur on their heads.