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There have been many studies about the use of tools by capuchins (Cebus and Sapajus spp.) particularly during the last two decades of the 20th century including experiments in captive settings and to a lesser degree in semi-free and wild conditions (Fragaszy et. al., 2004; Ottoni and Izar, 2008; Visalberghi and Fragaszy, 2012). Capuchins have been observed manipulating objects either out of curiosity or as a means to extract food (Fragaszy et al., 2004). There is very limited documentation, however, as to the use of objects as weapons either in response to a threat or as an aggressor. Wild capuchins have been reported to flail branches or drop objects on intruders (Chevalier-Skolnikoff, 1990; Fragaszy et al., 2004) and Boinski observed a male whitefaced capuchin (C. capucinus) use a branch to strike a boa constrictor pinned to the ground beneath a fallen branch (Boinski, 1988). Cooper & Harlow (1961) reported a tufted capuchin (C. a. fatuellus) in a laboratory struck a white-fronted capuchin (C. albifrons) with a stick in defense of food and the same tufted capuchin used a stick to defend himself when surrounded by a group of rhesus monkeys (Macaca mulatta) although he failed to hit any of them.

Observation of Weapon Use in A Group of Semi-Free Tufted Capuchins (Sapajus spp)