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 ...

In the aftermath of Earth’s most catastrophic extinction event, one unlikely survivor rose to dominate a shattered world: Lystrosaurus. Now, a stunning fossil discovery—an ancient egg containing a ...

The little skeleton was curled so tightly it looked as if it had never really entered the world. For years, that mattered because paleontologists suspected they were looking at something unusual, a ...

(CNN) - Researchers said a fossil found in South Africa proves for the first time that mammal ancestors laid eggs. The fossil belongs to a tightly-curled embryo of a Lystrosaurus. The Lystrosaurus is ...