Scientists Got It Wrong! This Wasn't a Baby T. rex After All

For a long time, scientists thought a dinosaur called Nanotyrannus was just a young T. rex that hadn't grown up yet. But when they looked super carefully at a tiny bone from its throat, they discovered it was actually already fully grown—and a completely different species! This smaller dinosaur was like T. rex's tough little cousin, and it probably hunted alongside the bigger dinosaurs, which means prehistoric Earth was even more crowded and exciting than we thought.