Tyrannosaurus rex was the apex predator of the late Cretaceous period, around 68–66 million years ago. Adults measured up to 12.3 meters long and weighed between 8,400 and 14,000 kg. Their jaws could exert a bite force of over 57,000 newtons — enough to crush bone. Despite their tiny arms, each forelimb could curl roughly 200 kg. Printable coloring page of a realistic T-Rex in a menacing stance with open jaws.