Study
Manufacture and use of hook-tools by New Caledonian crows
Hunt, Gavin R.
Nature, 1996
Systematic field observation of wild New Caledonian crows, documenting the tools they made from twigs and from the barbed edges of Pandanus leaves, and how those tools were used to extract prey from holes and crevices.
- Studied in
- Corvus moneduloides
- Sample size
- wild birds observed across sites in New Caledonia
The birds manufacture two distinct tool types to a consistent design, including hooked twigs, and use them to winkle out grubs. Tool-making followed standardised steps rather than improvisation.
What it means
The authors' reading, and ours. Where they differ, that difference is the point.
How the authors put it
New Caledonian crows manufacture tools to a cultural standard, a level of tool-making not previously documented outside primates.
How NatureHQ reads it
This is the observation that made corvid tool use a serious research field. The important detail for a general reader is the word "manufacture": the birds are not picking up a convenient stick, they are shaping material to a repeated design. It applies to one island species, and there is no evidence that the crows in a European or North American garden do anything comparable.
- Observational rather than experimental, so it establishes what the birds do, not why.
- Restricted to a single island species with an unusual ecology.
- Early work with limited quantification of variation between individuals.
What this study is used for on NatureHQ
One study can inform several subjects. Here is everywhere this one is cited.
Published by: Nature PortfolioPublished in a Nature Portfolio journal.
This reference was resolved automatically against Crossref and OpenAlex on 2026-08-11.
NatureHQ summarises research in its own words and does not reproduce published text. Reviewed 2026-08-09.