Capuchin monkey tool use: Overview and implications

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Stone tool use in wild bearded capuchin monkeys, Cebus libidinosus. Is it a strategy to overcome food scarcity? (2012, background): “…nonhuman primates, tool use is more plastic than in other vertebrates, present in some populations and absent in others and with geographical variation in forms among different populations (chimpanzees:Whiten et al. 1999; orang-utans: van Schaik et al. 2003a; capuchin monkeys: Ottoni & Izar 2008).”
Explosive Pleistocene range expansion leads to widespread Amazonian sympatry between robust and gracile capuchin monkeys (2012, background): “Present-day Sapajus in these dry habitats are known to use tools habitually to break open palm nuts, a behaviour not observed in any other Neotropical monkey (Ottoni & Izar, 2008).”
Bearded capuchin monkeys' and a human's efficiency at cracking palm nuts with stone tools: field experiments (2010, methodology): “In addition to using percussive tools, wild bearded capuchins use probing and scraping tools (Ottoni & Izar 2008; Mannu & Ottoni 2009).”
Ecology of culture: do environmental factors influence foraging tool use in wild chimpanzees, Pan troglodytes verus? (2013, background): “…found among the nonhuman primates and regular tool use is observed in some populations of chimpanzees (Whiten et al. 1999), orang-utans (van Schaik et al. 2003), bearded capuchin monkeys, Cebus libidinosus (Ottoni & Izar 2008) and longtailed macaques, Macaca fascicularis aurea (Gumert et al. 2009).”