Five orangutans at the Leipzig Zoo in Germany were each shown shelled peanuts. The nuts floated out of reach inside a clear 10-inch-high plastic tube quarter-filled with water.
All of the orangutans collected water from a drinker and spat it inside the tube to float the peanuts high enough to grab them, averaging three mouthfuls before success. In their first attempts, the apes on average took nine minutes before they got the nuts, but they only needed just 31 seconds by their tenth try.
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