About 250 million years ago, at the end of the Permian period, something killed some 90 percent of the planet's species. Less than 5 percent of the animal species in the seas survived. On land ...

The period of time before the Triassic was called the Permian. This was a time when a wide variety of animals lived, including a group of animals called the synapsids, which would later evolve ...

How could these water-loving animals have been so successful ... This extinction event marked the end of the Permian period ...

The mass extinction that ended the Permian geological epoch, 252 million years ago, wiped out most animals living on Earth ... while the first period of the Triassic—the Induan—had a disturbed ...