'Big Mouth Blunt Tooth,' a newly discovered fish, is challenging views on what life was like millions of years before dinosaurs existed.
An extinct dyrosaur, a type of crocodilian, was 16 feet (4.8 meters) long and tipped the scales at 900 lbs.
A fossilized tooth dredged from the bottom of the English Channel near Dorset, England, belonged to a formidable Jurassic marine predator and is the largest known tooth of its kind found in the U.K.
Aerial photos of the Colorado River pulse flow reaching the Gulf of California.
Perhaps the most peaceful time on the planet was around 540 million years ago, when the number one predator was a huge, yet gentle, shrimp-like creature.