We’ve got to tell you, just researching these terrifying, extinct animals made us thank our lucky stars that they’re not around anymore! In this video, we’ll take a look at some of the most disturbing, bone-chilling monsters that have ever walked the planet—monsters you’ll be sure to think about when you close your eyes for bed tonight. Get ready for some of the most fearsome predators this Earth has ever seen. This is Animals You’ll be Happy are Extinct

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4. Phorusrhacidae
When something is colloquially known as “terror bird,” you know that it’s best for it to have gone extinct before our time on the planet. They were a flightless species of bird, much like the ostriches of today, but they were bigger—much, much bigger. The phorusrhacidae was around between 62 and 1.8 million years ago, during the Cenozoic era, in South America, where they were the largest species of apex predator around. This animal stood between 3 feet 3 inches and 9 feet 10 inches (1 and 3 meters) tall, and it’s believed the animal would stretch to its full height before slamming its head down onto prey to deliver a fatal blow. There are relatively new findings from Uruguay that suggest the phorusrhacidae may have survived until more recently than initially thought; somewhere between 450,000 and 17,000 years ago!

3. Mosasaurus
We wouldn’t have wanted to deal with a giant, predatorial, aquatic lizard, and that’s precisely what the Mosasaurus was, so it’s a good thing it went extinct millions of years ago. It lived approximately 70 to 66 million years ago in the late Cretaceous period during the Maastrichtian age in both North America and Europe. The first specimen of said reptilian creature was found near the Meuse River, which is why its name means “lizard of the Meuse River,” or “Meuse lizard.” Mosasaurus’ were thought to grow to be around 56 feet (17 meters) in length, and lived near the ocean’s surface due to poor eyesight. They preyed on smaller mosasaurs, turtles, fish, pterosaurs, birds, and plesiosaurs. Sounds like a lizard creature we’re better off without!

2. Titanoboa
This huge slithery sucker once lived in what is today La Guajira in the northeastern part of Colombia. It was a giant genus of snake that could reach lengths of 42 feet (12.8 meters) and could weigh a crazy 2,500 pounds (1,135 kilograms)! It thrived in the Middle to Late Paleocene epoch, roughly 58 to 60 million years ago, just after the Cretaceous-Paleogene extinction event. The largest known snake ever was Titanoboa cerrejonensis, the only known species of Titanoboa. Scientists believe that very large turtles and Crocodylomorpha, whom it shared habitats with, probably would have served as prey for the gigantic snake. The thing ate dinosaurs and the oversized ancestors of crocodiles, so we don’t even need to say much more.

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