Interestingly, the pivotal thumb adaptation wasn’t present in the hands of Australopithecines, according to the study, despite being alive around the same time as our opposable-thumb-wielding SA specimens. ![]() The remains of those given access to the dexterous upgrade lived in what we now call South Africa and likely belonged to either an early Homo species or the extinct hominin side branch Paranthropus robustus. The researchers estimated how powerful the thumb was in some of our fossil human relatives by virtually modeling a muscle in the thumb that is important for opposability and the motion that. Their findings suggest that a key ingredient to the thumb’s success as an opposable digit first emerged around 2 million years ago. Researchers say the Monkeydactly, a type of darwinopteran, named for Charles Darwin, used. Importantly, we were able to validate the predictions of our models by confirming that the differences observed between living taxa –chimpanzees and modern humans – reflect those reported from past experimental studies." An opposed thumb is extremely rare among reptiles they are commonly found in humans and other mammals. "This process includes the precise 3D study of the areas of the bones where muscles attach in life. ![]() A gift of evolution, this innate genetic complexity places us legions. ![]() "Our methodology integrates cutting-edge virtual muscle modeling with three-dimensional analysis of bone shape and size," said first author and hand biomechanics expert Alexandros Karakostis, in a statement. The opposable thumbs enable the act of skilled manipulation that allows us to grip things.
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