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Published online 4 July 2007 | Nature | doi:10.1038/news070702-7
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Smart apes spit
Orang-utans use water to solve peanut puzzle.
Orang-utans can solve a brain-teaser that would vex many human minds, researchers have found.
Faced with a vertical transparent tube, a quarter filled with water, in which a peanut floats tantalizingly beyond reach, what should you do? Five orang-utans from Leipzig Zoo in Germany all came to the same conclusion.
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