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Visalberghi E, Fragaszy DM, & Savage-Rumbaugh ES. (1995). Performance in a tool-using task by common chimpanzees (Pan troglodytes), bonobos (Pan paniscus), an orangutan (Pongo pygmaeus), and capuchin monkeys (Cebus apella). J. Comp. Psychol., 109, 52.
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