In a groundbreaking discovery, scientists have confirmed that mammal ancestors laid eggs, thanks to a 250-million-year-old fossil of a curled-up embryo. The fossil, belonging to the species Lystrosaurus, was analyzed using advanced imaging technology, revealing it was encased in a large, soft-shelled egg packed with nutrients.
Lystrosaurus, a hardy survivor of Earth’s most catastrophic extinction event, dominated the post-apocalyptic landscape. This finding resolves a long-standing debate among paleontologists about the reproductive methods of early mammal relatives. “This fossil is a smoking gun,” said one researcher involved in the study. “It finally proves these creatures reproduced by laying eggs.”
The discovery sheds light on the evolutionary transition from egg-laying to live birth in mammals. Future research will explore how and why this shift occurred, offering deeper insights into the history of life on Earth.