 Gestation lasts for eight to nine months, after which a single calf is born. In the Bale Mountains National Park, births occur throughout the year, but peak from September to November. Calves remain in cover for the first few weeks after birth. The calves remain close to their mothers for nearly two years. The young females may get pregnant by then. The young males, as they mature by two years, are challenged by other males and driven out of their herds. The lifespan of a mountain nyala is around 15 to 20 years.
