期刊
ANIMAL COGNITION
卷 11, 期 3, 页码 413-422出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10071-007-0131-2
关键词
nut cracking; capuchins; tool use; tool selection; weight; hammer
The extent to which tool-using animals take into account the properties of the tool is little explored. The use of percussors to crack open encapsulated fruit is a complex form of tool use, the choice of an adequate tool being a critical aspect in success. Several properties (e.g., material, resistance, friability, shape and weight) affect the suitability of an object to open a hard-shelled nut, with weight being amongst the most important factors. In general, heavier tools require fewer strikes to crack open a nut.
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