Tyrannosaurus Rex was a bipedal carnivore which used to live in the western North America during the Maastrichtian age of the upper Cretaceous Period (about 70 million years ago). It was one of the biggest land predators which a size up to 13 metres from head to tail and about 4 metres of height (until its hips, its higher part as they walked kind of bend), and they weigh up to 7 tons. It's not clear yet if the Tyrannosaurus Rex was a predator or a scavenger.