The Permian-Triassic extinction eliminated almost 90 percent of all species. The devastating loss came after violent volcanic ...

About 250 million years ago, at the end of the Permian period, something killed some ... we would have seen animals as abundant and diverse as those of today's Serengeti, except most would have ...

However, even the trilobites' evolution could not help the trilobites escape the Permian Period, where there was a mass ...

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 ...

Therapsids, the ancient relatives of mammals, once roamed Earth in great numbers during the middle to late Permian period.

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 ...

Nobu Tamura/Wikimedia Commons The Triassic Period (252-201 million years ago) began after Earth's worst-ever extinction event devastated life. The Permian-Triassic extinction ... a group of animals ...

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 ...

During the first period of the Mesozoic Era (Triassic Period), many new types of animals evolved to fill ... It is referred to as the Permian-Triassic extinction event because it spanned these ...