Why some capuchin monkeys (Cebus apella) use probing tools (and others do not).
Westergaard, Gregory Charles; Lundquist, Andrew L.; Haynie, Michael Katherine; Kuhn, Heather E.; Suomi, Stephen J.; Journal of Comparative Psychology, 1998, vol. 112, issue 2, p 207, ISSN 07357036. ISBN 07357036.

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