Activity rhythms and use of space of a group of Aotus azarae in Bolivia during the rainy season

Abstract

A group of Aotus azarae living in an island forest in the Beni region of Bolivia was observed for ten nights during the rainy season of 1985. The three members of the group, an adult male, an adult female, and the young of the year, spent 49.4% of their time resting, 31.7% feeding and 19.8% locomoting. Activity started with low intensity vocalizations about 10-15 min after sunset, the animals returning to the sleeping site in the morning, 10 to 20 min before dawn. Feeding occurred mainly during the early hours of the night, and from 1:30 a.m. to 4:00 a.m. they spent most of their time at rest. The average distance travelled per night was 337.4 m, the monkeys locomoting mainly in the first half of the night. Of the whole of the island forest (0.33 ha), our monkeys used mainly an area of 0.18 ha. © 1987 Japan Monkey Centre.