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 ... shutter on a geologic scale of ...

They roamed the world during the Mesozoic, a geological period ... and Permian Eras (the time before dinosaurs) and also enormous. Unearth the nine massive prehistoric animals that lived before ...

As a period of geologic time ... 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 ...

They lived and thrived during many geological periods before ... where there was a mass extinction of animals on Earth. During the Permian Period, there was massive global warming.

Learn more about a time period marked ... of all prehistoric animals. More than 17,000 species are known to have survived until the mega-extinction that ended the Permian period 251 million ...