The Tyrannosaurus Rex lived in North America. It grew to be about 40 feet long (12 meters) and it’s thought to have weighed over 12,000 pounds (6,000 kilos). Take a look at these pictures. What do you notice?

It had short arms, but powerful legs, tail, and jaw. It was a meat-eater, a carnivore and could eat other large animals. 

Similar to birds, they had holes, air sacs, in their bones to make them lighter. This is seen in the head of the T-Rex. It’s head was so huge that it had to be lighter to be able to hold it up. 

(pictures: public domain)