期刊
BIOLOGY LETTERS
卷 3, 期 2, 页码 173-175出版社
ROYAL SOC
DOI: 10.1098/rsbl.2006.0603
关键词
Corvus moneduloides; New Caledonian crow; parallel tool industries; tool specialization; transmission mechanisms; vertical social learning
Individual specialization in the use of foraging tools occurs in hunter-gatherer societies but is absent in non-human primate tool use. `Parallel tool industries' in hunter-gatherers are mainly based on strict sexual division of labour that is highly reliant on social conformity. Here, we show that 12 individuals in a population of New Caledonian crows on Mare Island had strong preferences for either stick tools or pandanus tools. Eight of the 12 crows had exclusive preferences. The individual specialization that we found is probably associated with different foraging niches. However, in spite of sexual size dimorphism there was no significant association between the sex of crows and their tool preferences. Our findings demonstrate that highly organized, strict sexual division of labour is not a necessary prerequisite for the evolution of parallel tool industries.
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