10 Creatures That Actually Existed That Will Give You Nightmares

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Sometimes truth is stranger than fiction – and that is absolutely the case when it comes to some of the nightmare-inducing creatures that used to walk Earth.

From OMGFacts.com:

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1. Megatherium

As goofy as it might sound, this was ultimately a deadly sloth. It seems difficult to believe that the modern adorable creatures have this hiding somewhere in their evolutionary history, but it’s true. And they only died off around 10,000 years ago…it’s very possible a few cave people had to deal with these monsters.

2. Megalodon

The photo of that tooth really should sum this up pretty nicely. The Megalodon was supposedly around 60 feet long, and weighed between 50 and 100 tons. A Great White shark is usually about 20 feet long, so…take whatever you might feel watching Jaws, and multiply that by 3.

3. Gorgonops

This guy is 260 million years old, making it older than the dinosaurs. The Gorgonops was incredibly fast, large and had outrageously large teeth.

4. Liopleurodon

This creature was 20 feet long and twice as mean. Just look at that jaw…you don’t even want to be near that thing.

5. Sarcosuchus

Recognize this one? This is the distant ancestor of the crocodile. 40 feet long and weighing in at 8 tons, you didn’t want to run into this creature on your family vacation to Florida.

6. Phorusrhacidae

If you have earned the historic nickname of “Terror Bird,” you were definitely up to no good.

7. Mosasaurus

The Cretaceous period had to deal with this horrific beast, which was sort of like a crocodile but also with freaking FINS so it was outrageously fast in the water. Sounds like something from a nightmare, right?

8. Titanoboa

This ABSOLUTELY TERRIFYING creature went extinct around 2.5 million years ago, and good freaking riddance. It weighed 2,500 pounds and was the largest snake to ever exist. Indiana Jones would have a field day with this thing…

9. Thalattoarchon

28-Feet of pure terrifying predator. That jaw devoured many an opponent.

10. Quetzalcoatlus

This monster bird is thought to be the largest flying mammal to have ever existed on Earth, with a wingspan reaching the grand total of 35 feet and an estimated weight of about 500 pounds…YIKES.