The fossilized remains of a Lystrosaurus now answers the question scientists have asked for years: Did mammals once lay eggs?

Discovery of a Lystrosaurus embryo inside an egg proves early mammal relatives laid eggs and survived mass extinction through ...

In the aftermath of Earth’s most catastrophic extinction event, one unlikely survivor rose to dominate a shattered world: ...

Using synchrotron X-ray CT scans of a fossilized, intact embryo, researchers found evidence that the plant-eating mammal ...

This semi-aquatic mammal may look improbable, but its biology reveals how evolution shapes even the strangest mammal bodies.

Between 280 and 200 million years ago, a group of animals evolved which would eventually give rise to mammals, including ...

The little skeleton was curled so tightly it looked as if it had never really entered the world. For years, that mattered ...