Wild crows reveal tool skills

January 11, 2010, Oxford University

Wild crows reveal tool skills
Crow tool use in the wild. (c) University of Oxford
(PhysOrg.com) -- A new study using motion sensitive video cameras has revealed how New Caledonian crows use tools in the wild, Oxford University scientists report.

A new study using motion sensitive video cameras has revealed how New Caledonian crows use tools in the wild.

Previous work has shown the sophisticated ways in which crows can use tools in the laboratory but now a team of scientists from Oxford University and the University of Birmingham have investigated tool use in its full ecological context. The researchers recorded almost 1,800 hours of video footage for the study and publish their findings in .

In the wild, New Caledonian crows use tools for many purposes, including 'fishing out' large beetle larvae from holes in dead wood. In the new study the team were able to show for the first time that more larvae were extracted by crows using tools than with their beaks.

They also discovered that adult crows appeared to be much more skilled at obtaining larvae than juvenile crows, suggesting that considerable learning - possibly from copying more experienced ‘larvae fishers’ - is required for crows to become competent at this task.

Aside from recording the the team also collected a large sample of tools that crows had left inserted into larvae burrows. By comparing the length of the tools to the burrows, they found that, on average, longer tools are found in deeper burrows - suggesting that wild crows, like their cousins in the laboratory, are able to match the ‘right’ tool to the task. The collection also showed that wild do not select tools randomly, from debris on the forest floor, but are more likely to choose leaf-stems than twigs, and are more likely to use tools of a certain size range.

Explore further: Crows can use 'up to three tools'

More information: The report, ‘Tool use by wild New Caledonian crows Corvus moneduloides at natural foraging sites’, is published online in Proceedings of the Royal Society B.

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OdinsAcolyte
1 / 5 (1) Jan 11, 2010
Only the urban bred and raised did not already know this.
barakn
1 / 5 (1) Jan 11, 2010
OdinsAcolye, how could having a rural upbringing possibly give you special knowledge of a crow species endemic to a small island group in the Pacific? Most rural people are not from Nouvelle-Calédonie and wouldn't have the faintest idea this species existed let alone have any idea about its behavior in the wild.
Eco_R1
not rated yet Jan 12, 2010
crows in africa display the sam use of "tools" for similar tasks, nothing new...moving on

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