A 236-million-year-old fossil challenges the story of mammalian live birth - Phys.org

A 236-million-year-old fossil challenges the story of mammalian live birth Phys. org A 236-million-year-old fossil could rewrite the story of mammalian birth sciencedaily. com Mammal ancestors were giving birth to live young 236 million years ago New Scientist These mammal ancestors birthed live young far earlier than thought Science News New fossil evidence upends long-held assumptions about how mammals gave birth bioengineer.