One fun fact about the Tyrannosaurus rex is that the word "rex"comes from a Latin word meaning "king," while the word "tyrannosaurus" comes from a Greek word meaning "tyrant lizard." The T. rex lived in western North America 65 million years ago. This was the time of the Cretaceous period and was only a short time before dinosaurs became extinct.
The T. rex was carnivorous. When a T. rex turned 14 years old, it rapidly gained 1,300 pounds a year for four years. This animal had the ability to run up to 20 mph, covering 15 feet in one step.
The teeth of the T. rex were akin to blades and had a length of about 9 inches. They're the largest teeth of any carnivorous dinosaur. The Tyrannosaurus rex possibly had the most powerful bite of any creature.
Most movies and television shows portray the T. rex as being green, but scientists don't know if that was its true color. The animal was about 40 feet long and 13 feet high at the hip, and it used its humongous tail to keep itself balanced. A full-grown Tyrannosaurus rex weighed about 5 to 7 tons, which is 10,000 to 14,000 pounds. As of August 2015, scientists have not found an entire T. rex skeleton.