British zoologists were astonished when a captive crow - Betty - fashioned a hook out of wire to reach food.
It is the first time any animal has been found to make a new tool for a specific task, say Oxford University researchers.
They believe the bird shows some understanding of cause and effect.
It is the first time any animal has been found to make a new tool for a specific task, say Oxford University researchers.
They believe the bird shows some understanding of cause and effect.
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