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The spider monkey Ateles hybridus, one of the most threatened primate species in the Neotropics is restricted to Colombia and Venezuela (Defler, 2004). There are two sub-species present in Colombia: A. hybridus hybridus and A. hybridus brunneus (Froehlich et al., 1991 in Defler, 2004). The geographical range of the species includes the northwest region of the country, along the Magdalena River from the southern region of La Guajira to the northeast of the department of Boyacá (Defler, 2004). Populations of Ateles hybridus still exist in several Colombian departments (Magdalena, Cesár, Norte de Santander, Arauca, Santander, Bolívar, Antioquia and Caldas). Due to its limited distribution range, high hunting pressure, low birth rates and the accelerated transformation of its habitat, the species is now considered Critically Endangered (CR A3cd) and faces the highest risk of extinction in Colombia (Pinzón, 1998; IUCN, 2008; Defler and Rodriguez, 2003). Few conservation actions have focused on A. hybridus subspecies. In the 1970’s, there was an initiative to create a protected area at the Serranía San Lucas, where A. hybridus brunneus occurs, but the plan has not been realized (Defler, 2004).

Habitat characterization and population density of brown spider monkeys (<i>Ateles hybridus</i>) in Magdalena Valley, Colombia