Fossilized dinosaur feces are challenging some basic assumptions about dinosaur eating habits. Hadrosaurs, a kind of duck-billed dinosaur, are among the most common herbivores of the Cretaceous period ...

Trilobites, extinct marine arthropods that roamed the world's oceans from about 520 million years ago until they went extinct 250 million years ago at the end of the Permian period, may have grown in ...

Some big plant-eating dinosaurs roaming present-day Utah some 75 million years ago were slurping up crustaceans on the side, a behavior that may have been tied to reproductive activities, says a new ...