T. rex was a big dinosaur that ate meat. T. rex could be about 40 feet long, and it stood about 13 feet tall at the hips. A grown T. rex could weigh about six tons, like an elephant.

T. rex had about 60 teeth, and the biggest T. rex teeth, root and all, were about a foot long. T. rex teeth were replaced when they fell out. A T. rex skull could be five feet long, and T. rex had a bite strong enough to crunch bones.

T. rex had a very good sense of smell, and T. rex had large eyes and could see very well. T. rex ate big plant-eating dinosaurs such as Triceratops and Edmontosaurus. Scientists think T. rex was not very fast, perhaps 10 to 20 miles an hour at its top speed.

Scientists count growth rings in bones to tell how old a dinosaur was. T. rex grew fastest between about age 14 and age 18. T. rex lived fast and died young.

Sue is a famous T. rex skeleton that you can visit at the Field Museum in Chicago. Sue was found in South Dakota in 1990, and Sue is named after Sue Hendrickson, who found the skeleton. Sue lived about 67 million years ago, and Sue was 28 years old when she died.

As of March 2019, a T. rex nicknamed Scotty, found in Canada, is the largest T. rex known so far. Scotty had a hard life, with broken ribs and a jaw infection.

Words to know

• skeleton: all the bones
• infection: sickness