Scientists discovered a 250-million-year-old fossil proving Lystrosaurus, a mammal ancestor, laid eggs. This finding reveals how early mammals survived the End-Permian Mass Extinction, the most devastating extinction event in Earth's history.
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Archaeology Finds Archaeology Finds Knowledge
Mammal ancestors laid eggs—and this 250-million-year-old fossil proves it
250 Million Years Fossil age
End-Permian Extinction event
2 Million Years Timeline after extinction
Decades-Old Mystery Question solved
Decades-Old Question Answered mystery
252 Million Years Ago timeline
Most Devastating extinction severity