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Range DescriptionAotus brumbacki is a lowland night monkey, that extends east from the Cordillera Oriental in Colombia between the RÃos Arauca and Guaviare (Hershkovitz 1983; Defler 2003, 2004). The form occurring along the middle and lower reaches of the Meta, Tomo and Vichada and Guaviare has not been ascertained. Based on a specimen collected at Maipures, near the mouth of the RÃo Tomo on the RÃo Orinoco, Defler and Bueno (2007) indicated that the night monkeys of eastern central Colombia north of the RÃo Guaviare may be A. brumbacki, extending the range of this species to the RÃo Orinoco. Neither Bodini and PÃ©rez-HernÃ¡ndez (1987) nor Linares (1998) give any indication of the occurrence of A. brumbacki in Venezuela, north of the lower RÃo Arauca.