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Range DescriptionIn Colombia, Lagothrix lagotricha is known throughout the Amazon lowlands north-east to the Río Uva, a left bank affluent of the Río Guaviare in Vichada (Defler 2004). It extends east to the Río Orinoco and it may occur in Venezuela to the south of the Orinoco between the Ríos Orinoco and Cassiquiare (Linares 1998). Bodini and Pérez-Hernández (1987) reported that Lagothrix had never been collected in Venezuela, but that it should be found in the Territorio Federal Amazonas to the south of the Ventuari. It extends part way up the Rio Negro in Brazil – to the north at least as far the Ro Carauari. It does not occur in the eastern part of the Negro-Solimões interfluvium, but the exact boundaries of its occurrence there are not known. In Ecuador and Peru, it occurs north of the Rio Amazonas – Napo (L. poeppigii occurs to the south) (Tirira 2007). In Ecuador, the altitudinal range is 200 m to 1,400 m above sea level (Tirira 2007).