Strong between-site variation in New Caledonian crows' use of hook-tool-making materials.

Strong between-site variation in New Caledonian crows' use of hook-tool-making materials.
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DOI:
10.1111/bij.12757
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发表时间:
2016-06
期刊:
Biological journal of the Linnean Society. Linnean Society of London
影响因子:
--
通讯作者:
Rutz C
Rutz C
中科院分区:
其他
文献类型:
--
作者:
St Clair JJ;Klump BC;van der Wal JE;Sugasawa S;Rutz C

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功能工具的使用需要选择合适的原材料。新喀里多尼亚乌鸦Corvus moneduloides以其非凡的工具制作行为而闻名,包括用树枝状植被制作钩状工具。我们描述了野生乌鸦用于制造这些工具的植物材料的惊人的强站点之间的差异:在一个研究站点的乌鸦使用非本地灌木Desmanthus virgatus的树枝,而只有大约7公里远,鸟类显然忽略了这种材料,而支持尚未识别的树种的终端树枝。虽然当地植物群落的差异可能会导致这种惊人的模式,但乌鸦如何以及为什么对某些原材料产生如此强烈的特定地点偏好仍有待确定。
Functional tool use requires the selection of appropriate raw materials. New Caledonian crows Corvus moneduloides are known for their extraordinary tool‐making behaviour, including the crafting of hooked stick tools from branched vegetation. We describe a surprisingly strong between‐site difference in the plant materials used by wild crows to manufacture these tools: crows at one study site use branches of the non‐native shrub Desmanthus virgatus, whereas only approximately 7 km away, birds apparently ignore this material in favour of the terminal twigs of an as‐yet‐unidentified tree species. Although it is likely that differences in local plant communities drive this striking pattern, it remains to be determined how and why crows develop such strong site‐specific preferences for certain raw materials.
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