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Scientists confirm mammal ancestors laid eggs via fossilized embryo analysis.
Scientists in South Africa have confirmed that mammal ancestors laid eggs, using advanced imaging to study a 250-million-year-old fossilized embryo inside a soft-shelled egg.
This discovery resolves a long debate about the reproductive habits of early therapsids, specifically the tusked, pig-sized plant-eater Lystrosaurus, and suggests egg-laying helped these creatures survive mass extinctions.
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Los científicos confirman que los ancestros de los mamíferos pusieron huevos a través del análisis de embriones fosilizados.