T-Rex had competition, and it was absolutely terrifying. But here's the twist

Giganotosaurus, a giant carnivore, once dominated South America before T-Rex ruled. This "giant southern lizard" lived roughly 99.6 million to 97 million years ago, while T-Rex appeared nearly 30 million years later. Though they never met, Giganotosaurus was a terrifying predator, rivaling T-Rex in size.