There were some animals that lived on Earth millions of years ago that were scarier than dinosaurs. Some of these creatures were even bigger and more terrifying than the well-known T-Rex. One such animal was the Megalodon, a colossal shark that could reach up to 60 feet in length. Its jaws alone could measure up to 8 feet wide, making it one of the most fearsome predators of all time. Another scary creature was the Spinosaurus, a dinosaur that was larger than the T-Rex and had a sail-like structure on its back. It is believed to have been an excellent swimmer and was able to hunt both on land and in water, making it a formidable predator.