At this time of year they seem to have the advantage over similar sized diurnal species that were chased away from these food sources by larger diurnal monkey. Reproduction Aotus seem to rely most heavily on calls to find mates. Since calls are not common among Aotus trivirgatus , a hoot usually indicates a lone male or female looking for a mate. Copulations generally take place at night, though they have been observed in the day. Females give birth to only one offspring each year and rarely twins.
Infants are large and precocial at birth.
Gestation length is 133 days. Mating takes place around August and September such that infants are born in the season of high fruit production. Behavior Aotus trivirgatus live in monogamous pairs, a behavior unique to Aotus and Callicebus among the primates. There is evidence of long term pair bonding. Males are the primary caregiver of infants.