These strange animals are ... [+] semi-aquatic and only found on the island of Borneo. The earless monitor dates back to the late Cretaceous period, approximately 70 million years ago. Found only ...

The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.

part of the Paleozoic era, produced the most intense burst of evolution ever known. The Cambrian Explosion saw an incredible diversity of life emerge, including many major animal groups alive today.

“like the imprint of some animals’ fingertips and belly skin.” The Permian period, the last part of the Paleozoic Era, ended with the largest mass extinction in the history of life on Eart ...

revealed a significant rise in marine oxygenation during the Late Paleozoic era (400 million years ago), hundreds of millions of years after the emergence of animal-life. These findings suggest ...