Tyrannosaurus Rex was the dominant predator in the late Cretaceous period. The Tyrannosaurus Rex, or T-Rex for short, lived about 85 million to 65 million years ago. T-Rex often resided in moist, humid, semi-tropical areas, usually near rivers or forested swamps. T-Rex fossils have been found in North America and Mongolia. The T-Rex was a large, dangerous predator that walked on two powerful legs. It had tiny arms with two fingers each.

Their feet resembled birds and were fully equipped with gargantuan claws. Its tail was stiff and pointed, which helped it run. Tyrannosaurus was not a very fast runner and it needed all the help it could get. T-Rex had a solid, muscular body that was up to 40 feet long and 20 feet tall.

This beast was estimated to have weighed five to seven tons! Tyrannosaurus was designed for eating large chinks of meat. Its jaws were up to four feet long and had around 50 bone crushing teeth that ranged from one to nine inches. A T-Rex could eat up to 500 pounds of meat-in one bite! The T-Rex's jaw was designer to had upper overbite. This meant that when the jaws closed, the upper jaw fit inside of the parts of the lower jaw.

The Tyrannosaurus's kin was much like the skin of an alligator, having a scaly, hard texture. The T-Rex's head was made for hunting. It had large visual lobes in its brain that processed information quickly. This allowed for depth perception. The T-Rex also had large areas of the brain that processed odors.

A modern argument today is whether the Tyrannosaurus Rex was a predator or a scavenger. For years it was thought that the T-Rex was a predator because of its tails strong upper and lower jaw and it extremely muscular body. However, some paleontologists say that the T-Rex could not possibly have been a hunter. This is possible. Predators need to have large eyes to see their prey moving, while Tyrannosaurus had small eyes. Some say that it needed developed arms to hold or slash its prey, and the T-Rex had stick-like arms that only grew to about three feet.

The T-Rex also had big, bulky legs. This meant that the T-Rex could not have possibly caught nimble reptiles, which were present at the time it lived. Was the mighty T-Rex really a scavenger?" Tyrannosaurus Rex". UCMP's Tyrannosaur Rex Exposition web (12 November 2002). Dyllan.

"Tyrannosaurus" Dyllan's Tyrannosaurus Information Page web (13 November 2002).