dinosaurs had lots of big teeth

The meat-eating dinosaur Tyrannosaurus rex had teeth that were six inches long, which went along nicely with its 14,000 pounds and 18-foot height. Tyrannosaurus rex was about 40 feet long. Hadrosaurs had more than 2,000 teeth. When old ones wore out, new ones quickly grew in. Hadrasaurs may have looked like today's ducks. Their name, from Latin, means "duck-billed." A Hadrosaur was about 20 feet long and six feet tall.