Unearth the nine massive prehistoric animals that lived before dinosaurs ... It was among the largest reptiles during the Permian Era, featuring a 20-inch spiked skull and an armor-plated body ...

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 ...

This illustration shows the percentage of marine animals that went extinct at the end of the Permian era by latitude, from the model (black line) and from the fossil record (blue dots).

Among them were the chordates, to which vertebrates (animals with backbones ... survived until the mega-extinction that ended the Permian period 251 million years ago. A predator of the Cambrian ...

The Permian period’s mass extinction had wiped out ... At first, these creatures were much smaller, but they eventually outgrew other animals such as the Lystrosaurus, a dog-sized animal that ...

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 ...