Animals

Males fight viciously for mating privileges during these narrow time windows. Females typically mate with more than one male, often with one from another troop. Gestation is 134-138 days and usually one infant is born, sometimes two if food is abundant. Infants are carried ventrally the first two weeks, then on the back. At two and a half months the infant leaves the mother at times to play, explore and sample solid foods. Final weaning is at 5-6 months. Females in the group with newborns will handle and even nurse other females’ infants as well as attend groups of young as they play. Adult males emigrate periodically and some females are driven out. Life span is 27 years.
Males have fingernail-like wrist spurs which are used to rub on the scent glands of the inner arm and then scar branches and leave scent. They also have “stink fights” in which they face each other and wave tails which have been rubbed on strong-smelling wrist glands.
The palms of this lemur are long, smooth and leather-like, affording a firm footing on slippery rocks, and the great toe is smaller than other, more arboreal species.

Bibliography:
Novak, Ronald. 1999. Walker's Mammals of the World