Ancient Fossil Confirms Egg-Laying in Mammal Ancestors

A 250-million-year-old fossilized egg containing an embryo has provided definitive evidence that Lystrosaurus, an ancient relative of mammals, reproduced by laying soft-shelled eggs. This significant discovery resolves a long-standing scientific question regarding early mammalian reproductive strategies. It also offers valuable insights into the evolution of mammals and their survival following a major extinction event.