Almost all mammals give birth rather than laying eggs, and we have new clues about when they began to do so ...

Growth rings on a fossil bone suggest at least one mammal ancestor gave birth to live young rather than laying eggs 236 million years ago.

Scientists have long thought cynodonts, the ancestors of all modern mammals, laid eggs. For the first time, researchers have found evidence to the contrary.

Scientists found evidence of live birth in a mammal that lived more than 230 million years ago, rewriting evolutionary timelines.

Add Yahoo as a preferred source to see more of our stories on Google. Discovered: 150-year-old platypus specimen that proved some mammals lay eggs Jars of 150-year-old platypus and echidna specimens ...

Add Yahoo as a preferred source to see more of our stories on Google. Live reconstruction by artist Sophie Vrard. Fossil evidence shows mammal ancestors like Lystrosaurus laid eggs and used ...

The microscopic structure of fossilized bones helps solve ‘inscrutable mystery’ about the reproduction of ancestor of true ...

Some cynodonts may have been giving birth to live young much sooner in evolutionary history than previously assumed. A new ...

Modern monotremes, the egg-laying mammals alive today, lay relatively small eggs and make up for the limited yolk by feeding hatchlings with milk. Lystrosaurus seems to have followed a different path, ...

A remarkable new discovery is shedding light on one of the greatest survival stories in Earth's history, and answering a decades-old scientific mystery. Lystrosaurus, a hardy, plant-eating mammal ...