Unearth the nine massive prehistoric animals that lived before dinosaurs ... The Dimetrodon lived during the early Permian Period, and while it looks reptilian, it’s not related to dinosaurs.

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 ...

However, even the trilobites' evolution could not help the trilobites escape the Permian Period, where there was a mass extinction of animals on Earth. During the Permian Period, there was massive ...

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 ...

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 ...