Monkey Forest Tales: What we have learned about Brumback night monkeys over the past 15 years?

Aotus brumbacki (Colombian Llanos) Nest

This is the sixth and last post of a series in which the findings of this project are presented. In this post, the findings for the Brumback night monkeys are described. These monkeys are small size and the only nocturnal species in the study area. It is also the less studied species in this project.

We found them living in swamp, gallery and lowland forest and there are local people reports of individuals and groups in orchards too (Carretero-Pinzón & Defler 2008). They can use small forest fragments (< 5 ha) as home ranges for a few months while dispersing and probably while stablishing newly formed groups (Carretero-Pinzón personal observations).

They use living fences as part of their home ranges and for dispersion between forest fragment in highly fragmented landscapes (Carretero-Pinzón et al 2010). Solitary individuals have been observed eating and moving in living fences.

Brumback night monkey groups in the area, are usually of three individuals and up to 5 individuals (Carretero-Pinzón 2013). Densities of this species are higher in small fragments that in bigger fragments (Carretero-Pinzón 2013).

We had observed this species eating pioneer plants in the forest fragment edges, as well as arthropods (Vargas 2011). These monkeys use dead palms, palms of Moriche and Unamas and tall vines as dormitories in fragmented areas (Carretero-Pinzón personal observations). One study in the area identifies 10 vocalizations associated with activities made by a group of Brumback night monkeys (Vargas 2011).

This species is part of our new efforts as is one endemic Colombian primate species of which not much information is available.


Carretero-Pinzón, X. 2013. An eight-year life history of a primate community in fragments at Colombian Llanos. In: Primates in Fragments: Complexity and resilience, Developments in Primatology: Progress and Prospects. Marsh, L.K. & C.A. Chapman (Eds). Springer Science+Business Media, New york.

Carretero-Pinzon X., Defler TR. 2018. Primates and flooded forest in the Colombian Llanos. En: Barnett AA, Matsuda I, Nowak K (eds) Primates in flooded habitats: ecology and conservation, Cambridge University Press, Cambridge, UK.

Carretero-Pinzón, X., T.R. Defler & M. Ruíz-García. 2010. Uso de cercas vivas como corredores biológicos por primates en los Llanos Orientales. In: Primatología en Colombia: avances al principio del milenio. Pereira-Bengoa, V., Stevenson P.R., Bueno M.L. & F. Nassar-Montoya. Fundación Universitaria San Martín. Bogotá, Colombia.

Carretero-Pinzón, X., Defler, T.R. & S. Ferrari. 2008. Wild Black Capped capuchins (Cebus apella) feeding on a night monkey (Aotus brumbacki) in eastern Colombian Llanos. Neotropical Primates 15 (2): 62 – 63.

Vargas, M. 2011. Vocalizaciones de Aotus brumbackii (Hershkovitz, 1983) y su relación con las actividades en la vida silvestre, San Martín (Meta, Colombia). Pontificia Universidad Javeriana. Bogotá, Colombia.

Aotus brumbackii- Xyomara Carretero-Pinzón

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