250-Million-Year-Old Egg Solves One of Evolution’s Biggest Mysteries
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Discovery of a Lystrosaurus embryo inside an egg proves early mammal relatives laid eggs and survived mass extinction through rapid development and resilient reproductive strategies. A new fossil discovery is offering fresh insight into one of Earth’s most remarkable survival stories while resolving a long-standing mystery. Lystrosaurus, a tough, plant-eating ancestor of mammals, became widespread [...]
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