Suni feed on leaves, fungi, fruits and flowers, and need almost no free water. They are shy, most active at night, and sleep during the day in a shady, sheltered area. They are social but males defend a territory of about three hectares. They scent-mark the boundaries with secretions from their preorbital glands. There may be an individual or communal dung pile on the periphery of the territory. A male usually takes one mate, but other females may share his territory. A single calf is born weighing about two pounds, after a gestation of 183 days.