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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Wild capuchin monkeys adjust stone tools according to changing nut properties

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Author(s):
Luncz, Lydia V. ; Falotico, Tiago ; Pascual-Garrido, Alejandra ; Corat, Clara ; Mosley, Hannah ; Haslam, Michael
Total Authors: 6
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 6, SEP 14 2016.
Web of Science Citations: 9
Abstract

Animals foraging in their natural environments need to be proficient at recognizing and responding to changes in food targets that affect accessibility or pose a risk. Wild bearded capuchin monkeys (Sapajus libidinosus) use stone tools to access a variety of nut species, including otherwise inaccessible foods. This study tests whether wild capuchins from Serra da Capivara National Park in Brazil adjust their tool selection when processing cashew (Anacardium spp.) nuts. During the ripening process of cashew nuts, the amount of caustic defensive substance in the nut mesocarp decreases. We conducted field experiments to test whether capuchins adapt their stone hammer selection to changing properties of the target nut, using stones of different weights and two maturation stages of cashew nuts. The results show that although fresh nuts are easier to crack, capuchin monkeys used larger stone tools to open them, which may help the monkeys avoid contact with the caustic hazard in fresh nuts. We demonstrate that capuchin monkeys are actively able to distinguish between the maturation stages within one nut species, and to adapt their foraging behaviour accordingly. (AU)

FAPESP's process: 14/04818-0 - Tool use by wild bearded capuchin monkeys (Sapajus libidinosus): ecology, socially biased learning and behavioral traditions
Grantee:Eduardo Benedicto Ottoni
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/05219-0 - Tool use by capuchin monkeys: learning and tradition
Grantee:Tiago Falótico
Support type: Scholarships in Brazil - Post-Doctorate