An ancient worm-like animal that lived 518 million years ago has been identified as the first animal to evolve the loss of a body part it no longer needed. https://www.nhm.ac.uk/discover/news/2020/february/facivermis-earliest-evidence-of-an-animal-losing-its-legs.html?utm_source=tw-link-post-20200227-jd&utm_medium=social&utm_campaign=news
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