| http://www.w3.org/ns/prov#value | - he experiment found the animals were able to amplify the higher sounds by adjusting the shape of their vocal tract, including the mouth and tongue.It is a skill only mastered by a few humans, yet gibbons are able to do it with minimal effort, according to Takeshi Nishimura from the Primate Research Institute at Kyoto University.Singing is particularly important to gibbons, which use loud calls and
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