A 236-million-year-old fossil could rewrite the story of mammalian birth

ScienceDaily
Aug 13, 2026, 5:53 am15 pts
Scientists may have uncovered evidence that a mammal ancestor was giving birth to live young 236 million years ago. A fossilized cynodont showed a neonatal growth line and an unusually large birth size that closely match patterns seen in modern mammals. The discovery could push the evolution of live birth back…

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