10 Terrifying Extinct Prehistoric Beasts



With a name that means “carbon turtle”, what harm could this thing possibly do? Other than being carivorous, being the size of a Volkswagen, having a head bigger than a football, and a razor sharp beak that can slice through other animals with ease…nothing much.


Perhaps one of the more well known nopes in history, Arthropleura was basically a giant millipede the size of a car. it scuttled around ancient Carboniferous forests eating rotting plant matter. It was vegetarian. Mostly. I mean, who can’t resist a little bite of lizard once in a while if you’re a giant millipede the size of a fucking car?


Scorpions are badasses, considering that they have existed in one form or another for over 400 million years. Another thing that makes scorpions badasses is that they grew large. Like. Large. LARGE. LARGE. LIKE. HOLY JESUS. MASSIVE. GOD. Brontoscorpio was a meter long with a stinger the size of a lightbulb. But it was a sea scorpion with gills…so…it couldn’t have gone on land. Right? NOPE. THIS FUCKER WAS ONE OF THE FIRST ANIMALS TO CRAWL OUT OF THE SEA.


This thing makes Brontoscorpio look like a little puppy. A little armoured puppy with pincers and a stinger the size of a lightbulb. Jaekelopterus was the size of a crocodile with an appetite to match. It ravaged anything that stood in its wake. Other sea scorpions, ancient fish, ammonites…anything was on the dinner menu. It was also one of the largest sea scorpions in existence. Well fuck.



Earth’s first superpredator, Anomalocaris is the smallest animal on this list. Growing only to the size of your arm, however, does make this “abnormal shrimp” (that’s what its name means. Kinda fitting, really.) rather creepy. It was also the largest of its species known as the anomalocarids.


Oh fucking great. Another fucking giant fucking scorpion. Again, the badasses have returned to their massive sizes in the oxygen rich atmosphere of the Carboniferous period. Growing to the size of its ancient uncle, Brontoscorpio, it had a smaller stinger, but it was every bit as voracious. Thankfully for fish, Plumonoscorpius was fully terrestrial.


Imagine a kraken. Now put it in an armoured ice cream cone. You get Cameroceras. This giant ancient ancestor of squids and octopi was a slow mover due to its 12 meter long shell. Nonetheless, it was powerful enough to take down sea scorpions and ancient predatory fish. But seriously. Imagine if a kraken was actually wearing an armoured ice cream cone. That’d be hilarious.


Crocodiles are pretty scary on their own right. They hunt in rivers and lakes, staying in the shallows to grab prey from the shore. Cool. But they rarely venture far from water. Enter Kaprosuchus, whose name means “boar crocodile” because of its long ass chompers. This thing was an all terrain, six meter long killing machine. It can do what any crocodile could do. Go in the water, wait, attack, etc. BUT. It also could run on land. So any living thing living in Cretaceous Sahara was fair game. Oh, and it can also kill dinosaurs.


Snakes these days usually are pretty small. The largest, by mass, is the green anaconda. The longest is the reticulated python. Titanoboa would have eaten them as a snack. Measuring over 12 meters in length, it was the size of T.rex and its diet usually consisted of giant crocodiles and turtles that shared its territory. Thankfully for Tyrannosaurus, Titanoboa lived right after the dinosaurs’ extinction, ruling the earth just as the dinosaurs did before it.

Livyatan melvillei

This giant fucker would have made even MEGALODON cry. MEGALODON. You know that giant ass shark that everyone seems to love and are scared of? The one with teeth the size of your hand? This fucking whale trumps it. For starters: Livyatan was named after the Biblical monster, the one that even God himself had to kill. It also has the author of “Moby Dick” in its name too. Cool. But here come the best parts: It had teeth over a foot long. It grew LARGER than Megalodon. It hunted anything like baleen whales, beaked whales, dolphins, porpoises, sharks, sea turtles, seals and sea birds. If it encountered say…MEGALODON, it probably ran its ass over with its FOOT LONG TEETH.