But they were not the first ones to rule the planet. Long before the dinosaurs appeared, there were many other animals that thrived and evolved in different eras. These creatures were grouped ...

Where they lived: Dinosaur fossils have been found on every continent, including Antarctica. What they ate: Some ate plants, while others ate animals, including other dinosaurs. How big they were ...

The explosion of animal diversity really kicked off during the Cambrian period, about 540 million years ago. The first animals that lived on Earth roamed the seas. The oceans were ruled by jawless ...

Every hypothesis about how airborne dinosaurs evolved focuses on the behavior of animals we can’t observe in life. Experts have to draw out what clues they can from feathers, bones, the ...

researchers have found physical characteristics that indicate many dinosaurs, including ancient birds, were warm-blooded. The presence of feathers is one such indication — feathers help animals ...