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Scariest prehistoric animals! From huge dinosaur species to scary sea creatures. These are terrifying extinct creatures that actually existed.
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13 Megatherium
It’s fairly hard to imagine the present day sloth, with its slow & lazy demeanor, as a scary creature. However, its Pleistocene ancestor, the Megatherium, didn’t look so cute. In addition to being roughly the same size as a modern day elephant, it had large claws & scientific evidence suggests that it was even capable of bipedal locomotion.
12 Azhdarchid
Once believed to be a species of winged dinosaur, this prehistoric animal was in fact closer related to the gigantic marine creatures that lived around the same time, during the Cretaceous Period. The Azhdarchid was a species of large flying reptiles known as Pterosaurs.
11 Therizinosaurus
The feature that makes the Therizinosaurus so scary is not its massive size of 33 feet in length & up to five tons in weight but the enormous claws on each of the three digits on its front limbs. They are believed to have reached 3.3 feet in length, making them the largest claws of any known animal.
10 Daeodon
With a massive head that could grow up to 3 feet in length, strong neck muscles & a large bulky body, the Daeodon was the last & largest of the entelodonts, an extinct family of pig-like omnivores. These creatures roamed the Earth approximately 37 million years ago & stood as high as 6.5 feet at the shoulder with slender hooved legs that were built for speed. They had full sets of teeth which included molars, heavy incisors & large canines.
9 Meganeura
An ancestor of the modern-day dragonfly, the Meganeura is one of the largest known flying insects. It had a body length of approximately one foot & a wingspan that measured around 26 inches. It is believed that the Meganeura was carnivorous & predatory, feeding on other insects, amphibians & small invertebrates.
8 Jaekelopterus
This terrifying creature was the top predator of the waters it inhabited. The Jaekelopterus is currently the largest arthropod ever discovered with a total length that exceeded eight feet, making it larger than a fully grown human. Also known as ‘the giant sea scorpion’ this alien-looking creature had a segmented body with multiple specialized limbs, some of which featured spikes.
7 Dunkleosteus
Today our oceans are home to many scary creatures, but around 360 million years ago, when the Dunkleosteus swam their waters, the situation was much different. One component that added to the reputation of the Dunkleosteus was its sheer size. The Dunkleosteus terrelli, the largest of the species, measured up to 30 feet in length & weighed over a tone.
6 Megalania
Even though Komodo dragons are currently the biggest lizards on the planet, they still pale in comparison to their prehistoric ancestor, the Megalania, considered the largest terrestrial lizards ever discovered. Also known as ‘The Giant Ripper Lizard’ this beast inhabited southern Australia during the Pleistocene.
5 Gigantopithecus
Yeti, Sasquatch & other mythical ape-like creatures would most likely pale in comparison to the Gigantopithecus. This genus of ape is believed to have existed as recently as one hundred thousand years ago in the area that is now India, China & Vietnam. It same geographical location & the same time frame as several hominin species.
4 Livyatan melvillei
Its name was inspired by a biblical monster & by Herman Melville, the author of ‘Moby Dick’, a novel about a giant whale. When considering the etymology of its name, it’s not hard to imagine what Livyatan melvillei might have looked like. It was similar in size to a modern day sperm whale, measuring up to a staggering 57 feet in length, with an average skull size of 9.8 feet.
3 Liopleurodon
An apex predator of the Middle to Late Jurassic Period this marine reptile weighed as much as 3,700 pounds & measured up to 23 feet. Despite their enormous proportions, these creatures were good swimmers, using a four-flipper propulsion mode typical of the Plesiosauria order that they belonged to.
2 Sarcosuchus
Because of its long body & scaly appearance the Sarcosuchus bore a resemblance to the modern day crocodile. Nicknamed SuperCroc, this animal was not actually a crocodile but had many of the same terrifying features. These included muscular tails, powerful jaws & muscles, sharp teeth & plates, known as osteoderms that covered the creature’s body from head to tail.
1 Arthropleura
Many people are terrified of insects & bugs especially of those larger in size. However, none of the creepy-crawlers that are around today can compare to the creatures that lived around 300 million years ago that belonged to that Arthropleura genus. They are the largest known land invertebrates ever discovered. |