Newly found species explains how T. rex became king of dinosaurs (3)

Hans Sues, chair of the Department of Paleobiology at the Smithsonian's National Museum of Natural History, talks about the evolving history of dinosaurs at a news conference in Washington D.C., the United States, March 14, 2016. Scientists said Monday they have discovered the fossilized remains of a new horse-sized dinosaur that revealed how Tyrannosaurus rex (T. rex) became one of Earth's top predators about 70 to 80 million years ago. (Xinhua/Yin Bogu)