Acquisition of Nut-Cracking Behaviour by 2 Capuchin Monkeys (Cebus apella)

Abstract

The acquisition of nut-cracking behaviour was investigated in two naive groups of captive capuchin monkeys (Cebus apella). Two adult males acquired this behaviour independently and without any ad hoc training. The opportunity to freely explore and manipulate the ‘hammers’ favoured the discovery of the correct and successful spatial relationship between the nut and the tool. The other group members did not seem to learn the use of tools either independently or by observing their proficient cagemates.