Brown Spider Monkey
Though they live in groups of 20-30, they are rarely seen together. The females that are mothers will have a specific area that she remains in with her young until they have matured. As researchers have studied Ateles Hybridus for many years, they are scarcely seen in association with other primates.
Causes Leading to Extinction
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Thunstorm, M. "Ateles Hybridus (brown Spider Monkey)." Animal Diversity Web. N.p., 2009. Web. 18 Feb. 2016.
Urbani, B., Morales, A. L., Link, A. & Stevenson, P. 2008. Ateles hybridus. The IUCN Red List of Threatened Species 2008: e T29961A10280054.http://dx.doi.org/10.2305/IUCN.UK.2008.RTLS.T29961A10280054.en. Downloaded on 18 February 2016.