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Range DescriptionSaguinus leucopus occurs in northern Colombia, between the Ríos Magdalena and Cauca from their confluence in the Department of Bolivar (including the Isla de Mompos and the region south-east to the Department between the Ríos Cauca and Magdalena) south into the Department of Antiquoia along the west of Río Cauca basin as far west as the region of Caceres, Valdivia, the Río Nechi valley, and Porce. It probably extends southward along the tropical forested slopes of the Central Cordillera, west of the Río Magdalena, south into western Caldas and northern Tolima (at least as far south as the vicinity of Mariquita, ranging up to 1,500 m (Hernández-Camacho and Cooper 1976; Hershkovitz 1977; Hernández-Camacho and Defler 1989; Defler 2004). Hernandez-Camacho and Defler (1989) indicated the possibility that the range of S. leucopus extends further south-west along the east bank of the Río Cauca in Antiquoia, and further south into the gallery forests of the llanos and the forested foothills of the eastern slopes of the Central Cordillera in the Department of Tolima (see also Cuervo et al. 1986; Cuartas-Calle 2001; Cuervo et al. 2001).