6We investigated the process of nut-cracking acquisition in a semi-free population of tufted capuchin 7 monkeys (Sapajus sp) in São Paulo, Brazil. We analyzed the cracking episodes from monkeys of 8 different ages and found that variability of actions related to cracking declined. Inept movements 9 were more frequent in juveniles, which also showed an improvement on efficient striking. The most 10 effective behavioral sequence for cracking was more frequently used by the most experienced 11 monkeys, which also used non-optimal sequences. The nature of the elements that compose the nut 12 cracking task channels development, comprising some variation in behavior sequences and actions.
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