sciencehabit writes: From sturdy chimpanzees to massive gorillas to humans themselves, the living great apes are all large-bodied, weighing between 30 and 180 kilograms. So for years most researchers thought the ancestral ape must have tipped the scales as well. But the partial skeleton of an 11.6-million-year-old primitive ape may force scientists to reimagine the ancestor of all living apes and humans. With a muzzle like a gibbon but a large brain for its body size, the ancient primate has traits that link it to all apes and humans—yet it weighed only 4 kg to 5 kg, according to a report today in Science.
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