The oldest is the Paleozoic Era, which means ‘ancient life’ and ... of humans are leading to the extinction of animal species alive today. However, extinction is not a modern phenomenon.

A “demon-toothed” sea creature with “large, well-spaced fangs” has been identified as a new species after a researcher ... period of the Paleozoic Era, the New Mexico Department of ...

3 min read During the Ordovician period, part of the Paleozoic era, a rich variety of marine ... are more closely related to spiders and scorpions. A few species of these "living fossils" still ...

The Paleozoic era's Silurian period saw animals and plants ... or sea scorpions. Some species grew to more than six feet (two meters) in length and are considered the largest arthropods ever ...

When many species went extinct around the same time ... The largest extinction events define a change in era. The end of the Paleozoic and beginning of the Mesozoic 251 million years ago marks the ...

Fossils show that giant dragonflies and huge cockroaches were common during the Carboniferous period or the late Paleozoic Era. So, what caused these creepy-crawlies to grow so large, and why aren ...