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From
Times OnlineCrows are capable of using multiple tools in complex sequences, the first time such behaviour has been observed in non-humans, scientists have found. …
Seven New Caledonian crows were given the task of using three different lengths of stick to retrieve a reward — a small piece of pig’s heart. This was placed out of reach at the end of a transparent tube such that it could only be reeled in with a long stick.
Starting with a short stick, the crows had to first pull a medium stick towards them, and then in turn use that one to obtain the longest stick. [Emphasis added]
Five of the crows completed the task successfully and four of them did this on their first attempt.
The full original report is available
here.
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