If you think the modern animal kingdom is frightening, then wait until you get a load of the animals that existed millions of years ago. Most of the scariest creatures that used to really exist are related to animals we live with now; however, the animals we're glad are extinct were bigger and scarier - and for some reason, most of them had buzzsaw-like teeth.
Many of the scariest extinct animals are similar to dinosaurs. Some existed alongside the T-Rex, while others arrived post-asteroid and exhibited some of the dinosaur’s most frightening attributes. Many of the massive extinct animals have descendants alive today (a large number of them live in Australia), although they’re hardly as dangerous as their ancestors from millions of years ago.
Size: 40 feet long
When They Lived: 58 million years ago
Distinguishing Features: Obviously this is a very large snake. Not only did it grow to 40 feet in length, but it also weighed more than a ton. These giant snakes ruled the jungle and moved through swamps with ease.5,182716Is this a scary monster?
Size: 50 feet long
When They Lived: 400 million years ago
Distinguishing Features: Megalodons were big boys. Not only were they 50 feet in length, but they also weighed up to 50 tons. Because sharks are made of cartilage, they don't leave fossils behind. Instead, researchers have to use tooth size as a comparison tool.4,597630Is this a scary monster?
Size: 36 feet long
When They Lived: 72-83 million years ago3,610564Is this a scary monster?
Size: 26 to 32 feet long
When They Lived: Late Devonian (roughly 360-370 million years ago)
Distinguishing Features: These large, angry fish were built to hunt. They were some of the meanest predators in the water, and with their protected heads, they were hard to take down. Dunkleosteus didn't have actual teeth; however, it did have giant, sharp bones protruding from its mouth that were ready to chomp whatever was in front of the fish.2,562533Is this a scary monster?