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  Cashew nut positioning during stone tool use by wild bearded capuchin monkeys (Sapajus libidinosus)

Falótico, T., Luncz, L. V., Svensson, M., & Haslam, M. (2016). Cashew nut positioning during stone tool use by wild bearded capuchin monkeys (Sapajus libidinosus). Folia Primatologica, 87(6), 392-397. doi:10.1159/000459621.

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アイテムのパーマリンク: https://hdl.handle.net/21.11116/0000-0007-A5CA-B 版のパーマリンク: https://hdl.handle.net/21.11116/0000-0007-A5E5-C
資料種別: 学術論文

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 作成者:
Falótico, T., 著者
Luncz, Lydia V.1, 著者           
Svensson, M.S., 著者
Haslam, M., 著者
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1External Organizations, ou_persistent22              

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 要旨: Wild capuchin monkeys (<i>Sapajus libidinosus</i>) at Serra da Capivara National Park, Brazil, regularly use stone tools to break open cashew nuts (<i>Anacardium</i> spp.). Here we examine 2 approaches used by the capuchins to position the kidney-shaped cashew nuts on an anvil before striking with a stone tool. Lateral positioning involves placing the nut on its flatter, more stable side, therefore requiring less attention from the monkey during placement. However, the less stable and never previously described arched position, in which the nut is balanced with its curved side uppermost, requires less force to crack the outer shell. We observed cashew nut cracking in a field experimental setting. Only 6 of 20 adults, of both sexes, were observed to deliberately place cashew nuts in an arched position, which may indicate that the technique requires time and experience to learn. We also found that use of the arched position with dry nuts, but not fresh, required, in 63% of the time, an initial processing to remove one of the cashew nut lobes, creating a more stable base for the arch. This relatively rare behaviour appears to have a complex ontogeny, but further studies are required to establish the extent to which social learning is involved.

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言語: eng - English
 日付: 2016
 出版の状態: 出版
 ページ: -
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 査読: 査読あり
 識別子(DOI, ISBNなど): DOI: 10.1159/000459621
 学位: -

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出版物名: Folia Primatologica
種別: 学術雑誌
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出版社, 出版地: -
ページ: - 巻号: 87 (6) 通巻号: - 開始・終了ページ: 392 - 397 識別子(ISBN, ISSN, DOIなど): ISBN: 0015-5713