Every five-year-old’s favorite dinosaur, and our pick for the world's scariest extinct creature, the T-rex is dubbed "the king of the dinosaurs" and roamed the Earth around 66 million years ago. This predator dominated the food chain and is remembered for its massive size, powerful jaws, and tiny arms.

The T-rex is believed to have faced extinction during the Cretaceous-Paleogene event, possibly due to climate change or a catastrophic asteroid impact, long before any humans had to face down its terrifying teeth.

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