A freak DNA change 25 million years ago is why humans lack tails
One of the most striking anatomical features in apes, and which sets them apart from monkeys, is the absence of a tail. All mammals have a tail at some point during their development, but apes – including humans, chimpanzees, bonobos, gorillas, orangutans, and gibbons – lose them in utero, leaving behind three to five vestigial…
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