IN THE distant past, climate change may have driven limbless lizards to evolve legs - having already lost them before. The once-four-legged, ancient lizards of the Brachymeles genus first emerged in dry conditions in what is now South-East Asia. They lost all four limbs about 62 million years ago, but 40 million years later, some species grew them back, says Philip Bergmann at Clark University in Massachusetts.
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