Pouydebat E, Gorce P, Bels V, Coppens Y
USM 302, CNRS, Muséum National d'Histoire Naturelle, Paris, France.
Am J Primatol. 2006 Oct;68(10):1017-24. doi: 10.1002/ajp.20291.
We conducted an experiment to examine the effect of substrate on the nut-cracking behavior of a group of semicaptive capuchin monkeys. We wanted to determine whether tufted capuchin monkeys were selective in choosing the substrate on which they pound nuts, and whether the choice of substrate affected the outcome. Eight adult females and eight juveniles were provided with nuts in the outdoor facility. We found that 1) all adult females and three young capuchins succeeded in cracking nuts; 2) they preferred the hardest substrates (concrete and stone); 3) there is a link between the substrate and the amount of time needed to crack a nut; 4) most young capuchins used various substrates, some of which were inadequate, in a haphazard manner; and 5) there are different forms of nut cracking. We conclude that adult capuchins choose the hardest substrates, and that these substrates support efficient cracking.
我们进行了一项实验，以研究底物对一群半圈养卷尾猴坚果开裂行为的影响。我们想确定簇绒卷尾猴在选择用来砸坚果的底物时是否具有选择性，以及底物的选择是否会影响结果。在户外设施中给八只成年雌性和八只幼年卷尾猴提供了坚果。我们发现：1）所有成年雌性和三只幼年卷尾猴成功地敲开了坚果；2）它们更喜欢最硬的底物（混凝土和石头）；3）底物与敲开一个坚果所需的时间之间存在联系；4）大多数幼年卷尾猴随意地使用各种底物，其中一些并不合适；5）存在不同形式的坚果开裂方式。我们得出结论，成年卷尾猴会选择最硬的底物，并且这些底物有助于高效开裂。
