The Secret of Lystrosaurus: How a Tiny Animal Survived the Worst Extinction
An exceptional fossil has revealed that Lystrosaurus, a dog-sized protomammal, survived the Permian-Triassic extinction over 251 million years ago thanks to its large, soft-shelled eggs. The discovery of an embryo inside the egg solves a long-standing paleontological puzzle and shows nature's incredible resilience.