科学家通过化石胚胎分析证实哺乳动物祖先产卵. Scientists confirm mammal ancestors laid eggs via fossilized embryo analysis.

通过使用先进的成像技术, 研究在软蛋中的2.5亿年前化石胚胎. 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. 这一发现解决了关于早期类动物的繁殖习惯, 特别是长牙的大猪种植物食者莱斯特罗萨乌斯 (Lystrosaurus) 的长期争论. 它表明产卵帮助这些生物在大规模灭绝中幸存下来. 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.