236-Million-Year-Old Fossil Rewrites the History of Mammalian Live Birth
Researchers studying a 250-million-year-old fossil have uncovered the first ever proof that mammal ancestors laid eggs, a finding that reshapes our understanding of reproductive evolution. A PLOS One paper details that the specimen was found in South Africa and consists of a tightly coiled embryo belonging to a Lystrosaurus, a progenitor of mammals renowned for … Read more