Roughly 252 million years ago, Earth experienced its deadliest known extinction. Known as the Permian–Triassic Mass Extinction, or “The Great Dying,” this cataclysm wiped out over 80% of marine ...

As an extinction crisis wiped out species at the end of the Permian Period, a predatory species emerged that dominated Southern Africa’s domain. By Jeanne Timmons Some 252 million years ago, it ...

When the going got tough in the Paleozoic Era, trilobites rolled up. Armed with sturdy exoskeletons, these ancient arthropods curled up like armadillos to avoid predators or dangerous ...