ArticleAnimal cognition2023
Oscillatory extraction behaviour suggests functional attributes of crows' hooked-stick tools.
Article in Animal cognition, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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2 authors at 2 institutions in 2 countries.
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Abstract
New Caledonian crows are the only nonhuman animals known to craft hooked-sticks for use in foraging. Since their first description over 25 years ago, researchers have been unable to provide a detailed account of how these complex tools function in natural probe sites. Using close-up video footage, we document how a New Caledonian crow operated a hooked-stick to extract a large tree weta from a chamber in a tree trunk. The extraction technique had two distinct, separate components: (1) simultaneous oscillating head rotation and reciprocating bill action, and (2) measured pulling with the tool. Analysis of this first detailed field observation of hooked-stick use suggests a link between hooked-stick tool characteristics, functionality and skilled manipulation in natural prey extraction by these technological birds. Our findings also provide a rare, if not novel, example of tool-associated oscillatory manipulation in nonhuman animals.
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