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 ...

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.

Known as the Great Dying, the mass extinction that ended the Permian geological period was the worst of ... and there weren’t ...

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 ...