Bolivian Gray Titi

The white-eared titi is found in tropical humid forests, preferring drier regions to more humid ones. It is found in riparian zones and gallery forests and is clearly associated with open habitats like grasslands and swampy grasslands. It is found in areas with dense vegetation, often choosing to inhabit the thickest parts of the forest. The species seems to be quite tolerant of habitat disturbance. In Bolivia, the white-eared titi is found in the upper parts of the Mamoré, Grande, and San Miguel river basins, east of the Manique River in Beni and in the forests surrounding the city of Santa Cruz de la Sierra. Its range extends north to southern Rondônia in Brazil.

The white-eared titi is cryptic, diurnal and known to live in small family groups. It is a monogamous species that is thought to mate for life and lives in groups that usually consist of two to seven members; an adult pair and up to five young. Multi-male groups have also been recorded. Offspring are carried by the male, and are always with them, except when feeding. Between the ages of two and four years, offspring will disperse from the natal group, with females leaving earlier than the males.

There is a strong bond between the adult mating pair, they stay close and carry out activities together. Either member of the pair may follow the other and leadership changes through the day. Evidence of the strength of the pair bond is shown by grooming, huddling together with their tails twined, nuzzling, and gentle grasping. Titi monkeys are highly territorial and when confronted with another family group, both will respond with threatening behaviour, males showing increased agitation towards intruding males. When not close together, the pair show a significant amount of distress and agitation. Titi monkeys are well known for their vocal communication, and have a complex repertoire of calls. The calls can be divided into two categories: high-pitched quiet calls and low-pitched loud calls. …