250-Million-Year-Old Egg Solves One of Evolution’s Biggest Mysteries
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A 250-million-year-old Lystrosaurus embryo was discovered inside an egg, proving that early mammal relatives laid eggs and survived mass extinction through rapid development. The finding sheds new light on the reproductive strategies of ancient species.
A new fossil discovery has provided insight into the survival of Lystrosaurus, a mammal ancestor, after the End-Permian Mass Extinction 252 million years ago. Researchers found an egg containing a Lystrosaurus embryo, dating back 250 million years, in South Africa. The egg was soft-shelled, making it a rare find. The discovery confirms that Lystrosaurus laid eggs and its hatchlings were precocial, able to move and feed soon after hatching. The species likely reached reproductive maturity quickly, improving its chances of survival in a harsh environment. This strategy proved effective in a struggling ecosystem.
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