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

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Author(s)

James St Clair, Barbara Christina Klump, Jessica Eva Megan van der Wal, Shoko Sugasawa, Christian Rutz

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Abstract

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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Original languageEnglish
Pages (from-to)226-232
Number of pages7
JournalBiological Journal of the Linnean Society
Volume118
Issue number2
Early online date13 Jan 2016
DOIs
StatePublished - Jun 2016

    Research areas

  • Construction behaviour, Corvid, Cumulative culture, Extractive foraging, Innovation, Material culture, Raw materials selectivity, Tool manufacture, Tool selectivity, Tool use

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