The Tyrannonsaurus Rex, also known as T-Rex, is the answer. T-Rex is known as the “Tyrant King Lizard.” Its weight is about 6 tons and its height can range from 40 to 50 feet tall. It has a 4 foot long head and its teeth can be anywhere from 6 to 13 inches long. It had very small forearms compared to how large the rest of its body was. The T-Rex typically fed on plant eating dinosaurs, but was known to prey on its own as well.