In 2014, researchers led by Ibrahim argued that the predator was the first confirmed semiaquatic dinosaur, a hypothesis that generated pushback from peers who questioned whether the fossil Ibrahim ...

The impact triggered a nightmarish sequence of events that sent some 75 percent of plant and animal species spiraling to extinction— including all the nonavian dinosaurs.

All about dinosaurs. Read about dinosaur discoveries including gigantic meat-eating dinosaurs, earliest dinosaurs and more. Dinosaur pictures and articles.