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Orangutans use water as a tool mongabay.com July 6, 2007 German researchers have observed orangutans using water as a tool. Natacha Mendes, Daniel Hanus, and Josep Call of the Max-Planck-Institute for Evolutionary Anthropology in Leipzig, Germany conducted an experiment with five orangutans to see whether the red apes could access an out-of-reach peanut floating inside a vertical transparent tube. They quickly found that all five orangutans were able to do so by collecting water from a drinker and spitting it into the tube to raise the water level and gain access to the peanut.
"Additional control conditions suggested that this response was not due to the mere presence of the tube, to the existence of water inside, or frustration at not getting the reward," wrote the researchers. "The sudden acquisition of the behaviour, the timing of the actions and the differences with the control conditions make this behaviour a likely candidate for insightful problem solving." The research, titled "Raising the level: orangutans use water as a tool", is published in the current issue of Biology Letters Comments? News options
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