The forests in the range of this sifaka are highly fragmented, and isolated by extensive degraded grasslands. Most are deciduous formations similar in composition to transitional dry forests of western Madagascar, and this species occurs in them at altitudes up to 700 m (Meyers and Ratsirarson, 1989; Vargas et al., 2002). Of 75 forest tracts identified by researchers, 45 were inhabited by sifakas. Groups range in size from 3–10, with an average of five, and occupy territories of 9–12 ha (Meyers, 1993). Recent population density estimates range from 10–23 individuals/km2, and the total population is believed to be 6,000 to 10,000 animals (Meyers, 1996; Vargas et al. 2002).
This species is largely diurnal, though sometimes crepuscular during the rainy season, and sleeps at night in high emergent trees. Its diet consists of seeds, leaves, unripe fruits,
and flowers, and may also include tree bark during the dry season. Mating occurs in late January. Newborn infants are commonly seen in July and August, and weaning typically in December (Meyers and Wright, 1993; D. Meyers, pers. comm.).