The species Tyrannosaurus rex (rex meaning "king" in Latin), commonly abbreviated to T. rex, is one of the most well-represented of the large theropods. Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to its large and powerful hind limbs, Tyrannosaurus fore limbs were short but unusually powerful for their size and had two clawed digits. It was among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event.
The stegosaurus was an armored dinosaur that lived about 150 million years ago. It had a heavily rounded back, short forelimbs, head held low to the ground and a stiffened tail held high in the air. The double plates along its back were most likely used for defense and may also have regulated its temperature. Stegosaurus weighed about 6,800 pounds and was 9 feet tall.
The name from Greek means 3 horned face. This dinosaur was about 30 feet long, 10 feet tall and weighed 4 to 6 tons. Stout limbs supported its girth but it was unlikely the dinosaur could move very quickly. Like a modern-day rhinoceros, it probably spent much of its time grazing on plant matter.