Among 6 basic water displacement tasks, crows completed 4, including preferentially dropping stones into a water-filled tube instead of a sand-filled tube, choosing sinking objects to floating ones, using solid objects rather than hollow objects, and dropping objects into a tube with a high water level rather than a low one. However, they failed two more challenging tasks, one that required understanding of the width of the tube, and one that required understanding of counter-intuitive ...
via Medindia Health News
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