😂 The Tyrannosaurus rex, often called T. rex, was one of the largest and most powerful carnivorous dinosaurs to ever walk the Earth. Living during the late Cretaceous period, around 68 to 66 million years ago, it roamed what is now North America. This fearsome predator could reach lengths of up to 40 feet and stand about 12 feet tall at the hips. Its massive skull, filled with serrated teeth the size of bananas, was balanced by a long, heavy tail that helped it stay agile despite its size. With