Hundreds of animals, from tiny ants to mighty hippos, are shaping the Earth's surface as powerfully as floods and storms.

Although dinosaurs were the largest land animals to ever live, not all dinosaurs were huge. Some were pretty tiny. For example, Compsognathus was only about 2.5 times as long as an average man's ...

All animals need water to survive. Land animals will get water by drinking it. Fish and other aquatic animals absorb it through their skin. Animals need shelter for protection. It protects them ...

and all of its vital systems became adapted to a marine existence -- the reverse of what happened millions of years previously, when the first animals crawled out of the sea onto land. Some ...

One of the most important milestones in the evolution of life began some 400 million years ago, when the first animals made their way from water onto land. At that time, known as the Devonian ...

Tyrannosaurus rex was one of the most ferocious predators to ever walk the Earth. With a massive body, sharp teeth, and jaws so powerful they could crush a car, this famous carnivore dominated the ...