Fossil discovery suggests mammal-like reptiles gave birth to live young, rewriting evolutionary history

A groundbreaking study of fossilized remains is challenging long-held beliefs about mammalian evolution, suggesting that live birth may have originated much earlier than previously thought. The research focuses on cynodonts, reptile-like creatures that were ancestors to mammals.

Scientists analyzed the bone tissue of Chiniquodon theotonicus, an animal that lived approximately 236 million years ago. Their findings indicate a striking similarity in the ratio of offspring body mass to adult body mass compared to modern mammals. This suggests that these ancient creatures reproduced by giving birth to live young, rather than laying eggs.

If confirmed, this discovery could significantly alter the timeline of mammalian evolution, potentially pushing back the origin of live birth by as much as 95 million years. The study's implications extend to understanding the complex evolutionary path that led to the diverse mammalian species alive today.