The Black-striped Capuchin, Cebus libidinosus, also known as the Bearded Capuchin, is a capuchin monkey from South America. It was the first non-ape primate where tool usage was documented in the wild, as individuals have been seen cracking nuts by placing them on a stone "anvil" while hitting them with another large stone.Fragaszy, D., Izar, P., Visalberghi, E., Ottoni, E. B., & Gomes de Oliveira, M. (2004). Wild Capuchin Monkeys (Cebus libidinosus) Use Anvils and Stone Pounding Tools. American Journal of Primatology 64: 359366. The Black-striped Capuchin has traditionally been considered a subspecies of the Tufted Capuchin. On the contrary, the southern population here included in C. libidinosus has sometimes been considered another species, the Azaras's Capuchin, C. cay (syn. C. paraguayanus).
The Black-striped Capuchin is found in the Caatinga, Cerrado and Pantanal of Brazil, and forests and woodlands in Paraguay, far eastern Bolivia and northern Argentina. Some confusion surrounds the taxon juruanus, here included as a subspecies of the Black-striped Capuchin. It has been considered to occur from the upper Jurua River east and south to Mato Grosso,Groves, C. (2001). Primate Taxonomy. Smithsonian Institution Press. ISBN 156098872X or alternatively entirely restricted to the region near the upper Jurua River.Fragaszy D., Visalberghi E., & Fedigan, L. (2004). The complete capuchin. Cambridge University Press. ISBN 0521661161 In the latter case, its range would be surrounded by C apella, leading to doubts over its true taxonomic status.
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