El Aotus trivirgatus, Known as the night monkey, it is in danger of extinction nationwide.. It is a species of 37cm in length with an approximate weight of 450 a 1250 g, with a dense, woolly coat of gray to brown hair; feeds on fruits, nectar, leaves, insects, birds and small mammals.

It is endemic to the Serranía de Perijá Integrated Management District., in all aspects of it. They live in pairs together with one or more offspring of different ages and are characterized by systematically emitting 50 a 100 different sounds to communicate with each other. Además, They act as dispersers and pollinators of plant species in the middle stratum of the forest., which it feeds on.

Corpoguajira aims to conserve species, even more so if they are in danger of extinction or vulnerability, In its responsibility, it manages strategies that allow it to safeguard its existence, as in the case of the ongoing project “Rehabilitation of vegetation covers in degraded areas in the micro-basins of the Urumita and El Molino rivers.”, the La Yaya and Las Pavas streams, belonging to the municipalities of Urumita, El Molino, Barracas and Fonseca” that through the closure of water circuits will be able to rehabilitate the forest and species such as the nocturnal monkey will be able to remain in their habitat and collect fruits for their food..