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    Megalodon, The Whale-Sized Shark

    Megalodon, The Whale-Sized Shark

    [ranking: 1]
    Measuring at more than 50 feet long, the megalodon was the largest known shark of all time. Their jaws alone were large enough for a full-grown person to walk through with ease, and they used those jaws to hunt whales. To put it in perspective, researcher Peter Klimey with the University of California at Davis said, "A great white is about the size of the clasper, or penis, of a male megalodon.??
    Scientists believe that megalodons hunted whales by first ripping off their tails and fins - immobilizing their prey so they could more easily feast. It is also believed that the extinction of these giant sharks is what allowed whales to reach the enormous sizes that they are known for today. Researchers confirmed that the last megalodon died only 2.6 million years ago, right around the same time the evolution of the first humans began to take place.
    More Megalodon
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    Dunkleosteus, An Armored Death Machine

    Dunkleosteus, An Armored Death Machine

    [ranking: 2]
    This ancient fish lived 400 million years ago, but its bite has stood the test of time. Scientists believe the Dunkleosteus had the strongest bite of any fish ever discovered - one that could be compared to the bite of a Tyrannosaurus rex. Scientists have crunched the numbers and determined that, just at the tip of its fang, this fish??s bite could measure at 8,000 pounds per square inch. They were absolute apex predators, preying on sharks and basically anything it could catch (everything). Dunkleosteus was also 33 feet long from tooth to tail and covered in thick armor-like plating, making it one of the ocean??s first giant predators.

    Helicoprion, The Spiral-Mouthed Killer

    Helicoprion, The Spiral-Mouthed Killer

    [ranking: 3]
    Terrorizing the seas nearly 300 million years ago, the Helicoprion was a bizarre species of shark that sported one of the craziest sets of teeth in natural history. This unusual feature has been the subject of widespread debate in the scientific community for a century, and it??s easy to see why. The only fossils that have been found of this animal contain sets of spiraled teeth, and scientists are still trying to figure out just how they would have possibly fit into the shark??s mouth.
    What they do know is that, like many modern sharks, the Helicoprion most likely had to replace their teeth pretty regularly. And although many illustrations show the Helicoprion with a buzz-saw mouth, some scientists believe that the tooth-spiral may have actually been located inside the shark??s throat. Others claim it was more like a ratfish than a shark, with its teeth positioned at the rear of its jaw.

    Mosasaurus, A Ferocious Prehistoric Predator

    Mosasaurus, A Ferocious Prehistoric Predator

    [ranking: 4]
    The Mosasaurus became an international celebrity after its breakout performance in Jurassic World, and the real-life version is just as impressive. These giant reptiles could likely swallow most of their prey whole but preferred slicing meals into bite-sized morsels with their backward-bending teeth.
    Paleontologists have been studying these animals for years, and a recent discovery has shed new light on the early lives of mosasaurs. Researchers examined two baby mosasaurs and learned that they actually spent their early lives in the open ocean. This discovery has led some scientists to believe that mosasaurs gave birth to live young.
    More Mosasaurus
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    Liopleurodon, A Reptilien Behemoth

    Liopleurodon, A Reptilien Behemoth

    [ranking: 5]
    The Liopleurodon was a giant marine reptile and one of the fiercest predators of the Jurassic period. These massive sea monsters could grow up to 30 feet in length (although some fossils suggest even larger sizes) and had sizeable teeth that would have made a quick meal out of most marine life.
    Despite its size, scientists estimate this reptile probably swam surprisingly fast, and like many sharks, Liopleurodon had an excellent sense of smell, which it used to locate prey. While this all may sound intimidating, chances are Liopleurodon was not even the largest animal in its class; that title most likely goes to Kronosaurus.

    Jaekelopterus, A Sea Scorpion Bigger Than You

    Jaekelopterus, A Sea Scorpion Bigger Than You

    [ranking: 6]
    Jaekelopterus reigned as an apex predator nearly 400 million years ago and was probably willing to eat anything smaller than itself - including members of its own species. These arthropods grew to over eight feet long and had huge, spiked claws that could ensnare fish with ease. Experts believe the Jaekelopterus ambushed prey with its claws before tearing the meal apart. Jaekelopterus is the largest discovered species of arthropod, a group that includes insects, arachnids, lobsters, and crabs.

    Livyatan Melvillei, The Whale That Ate Whales

    Livyatan Melvillei, The Whale That Ate Whales

    [ranking: 7]
    Named after Herman Melville, the author of Moby Dick, Livyatan melvillei was a massive species of sperm whale that is believed to have preyed on primarily baleen whales. This creature lived only 12-13 million years ago, which is frighteningly recent when it comes to the span of geological time. And while it is estimated to have been about the size of a modern sperm whale, it had foot-long teeth that suggest its food of choice was quite a bit bigger than your average squid.
    Modern sperm whales hunt by using suction - basically sucking prey directly into their giant mouths. Livyatan, however, most likely hunted in a fashion similar to that of orca whales, biting and tearing at their prey. And, yes, a human being could easily fit inside of Livyatan's mouth, making the whale in Melville??s beloved novel seem a lot less fictional.

    Plesiosaurs, Almost Too Strange To Believe

    Plesiosaurs, Almost Too Strange To Believe

    [ranking: 8]
    Plesiosaurs are made up of more than one species and lived about 135 million years ago. These long-necked predators served as the main inspiration for the infamous Loch Ness monster, and their unique anatomy has placed it at the center of controversy in the scientific community. Mary Anning, the renowned paleontologist who first discovered these creatures, was actually accused of forgery when she first brought a Plesiosaurus fossil to her colleagues. Interestingly, their iconic long necks were actually not very flexible, making most depictions of them fairly inaccurate. 

    Stethacanthus, An Ancient And Extraordinary Shark

    Stethacanthus, An Ancient And Extraordinary Shark

    [ranking: 9]
    This bizarre shark wasn??t the largest fish in the sea, but it is noteworthy thanks to one unique trait. Stethacanthus had an extremely unusual dorsal fin, completely unique in the shark fossil record, which scientists are still trying to understand. One suggestion is that male Stethacanthus used their anvil-shaped fin to attract mates, but others believe it could have been used to intimidate potential predators looking to munch on this cat-sized shark. Either way, these small, slow sharks were probably bottom-feeders.

    Leedsichthys, The Largest Fish Ever

    Leedsichthys, The Largest Fish Ever

    [ranking: 10]
    Even though scientists originally overestimated the size of this giant fish by whopping 40 feet, it is still considered to be the largest bony fish ever discovered. In fact, the Leedsichthys was so big that its gill bones have sometimes been mistaken for the bones of pterosaurs. Although they could grow up to 55 feet in length, their great size didn't make them great hunters. Like many sea giants, Leedsichthys survived by feeding on some of the smallest creatures in the sea: Plankton probably made up a majority of their diet, although it??s difficult to pinpoint the feeding habits of an extinct animal. Scientists believe that, even though the largest discovered specimen was around 55 feet, that these animals could likely have grown to be even bigger.

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About Random Most Horrifying Sea Monsters To Ever Terrorize The Ocean

It's an exciting tool for displaying random most horrifying sea monsters to ever terrorize the ocean. We collected a list of "Random Most Horrifying Sea Monsters To Ever Terrorize The Ocean" from ranker, which was screened by countless online votes. You can view random most horrifying sea monsters to ever terrorize the ocean shows from this page, click on "Show all by ranking" button to show the complete list, or visit the original page for a more detailed introduction.

The ocean is massive - and the creatures lurking beneath its surface can grow to sizes that would be impossible on land. Whales are the largest living creatures in the sea, but these gentle giants were preceded by some of the scariest sea monsters of all time. The fossil record is full of scary sea animals that would make Jaws look like a little guppy in comparison - so many that it’s a miracle that none of them are alive today (maybe). 

Giant fish, sharks, and reptiles dominated the oceans for millions of years, becoming the apex predators of one of the craziest and most diverse environments on our planet. Sea scorpions the size of crocodiles swam in the same waters as massive armored fish who could bite a great white in half. The oldest sea creatures were more terrifying than anything cartographers ever doodled onto their maps. These are some of the deadliest creatures of all time, the ones who epitomize the phrase “there’s always a bigger fish.”

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