Mammal ancestors laid eggs, and this 250-million-year-old fossil finally proves it

ScienceDaily
Apr 14, 2026, 10:20 am182 ptsTrendingTop
In the aftermath of Earth’s most catastrophic extinction event, one unlikely survivor rose to dominate a shattered world: Lystrosaurus. Now, a stunning fossil discovery—an ancient egg containing a curled-up embryo—has finally answered a decades-old mystery about whether mammal ancestors laid eggs. Using…

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