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Added by Milena on 25 Oct 2014 09:28
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Mind Blowing Extinct Creatures You’ll Be Glad....

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At an estimated length of over 8 feet, Jaekelopterus is one of the two largest arthropods ever discovered. Although sometimes referred to as a “sea scorpion”, in fact, it was really more of a giant lobster, living in freshwater lakes and rivers in today´s Western Europe. This terrifying creature lived approximately 390 million years ago, earlier than most dinosaurs.
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Carbonemys is an extinct genus of giant turtle that lived some 60 million years ago, which means they survived the mass extinction that killed most dinosaurs. A fossil found in Colombia suggests it had a shell that measured almost 6 feet. The turtle was carnivorous with massive jaws and powerful enough to eat large animals such as crocodiles.
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Living during the Ordovician period, 470 to 460 million years ago, Cameroceras was a giant ancient ancestor of modern squids and octopi. The most distinctive feature of this mollusk was enormous cone-like shell and tentacles that it used for catching fish and other sea creatures. The estimates regarding the size of the shell vary greatly from 20 to 40 feet.
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Colloquially known as “Terror birds”, these pre-historical creatures are an extinct genus of large carnivorous birds that were the largest species of apex predators in South America during the Cenozoic, 62–2 million years ago. The largest flightless predatory bird to have ever lived on Earth, Terror Bird was up to 10 feet high, weighed up to half a ton and supposedly could run as fast as a cheetah.
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Living approximately 60–58 million years ago, during the Paleocene epoch, Titanoboa is the largest, longest, and heaviest snake ever discovered. Researchers estimate that the largest individuals could have a total length of around 42 feet and weighed about 2,500 pounds. Its diet usually consisted of giant crocodiles and turtles that shared its territory in today´s South America.
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Meaning “big tooth”, Megalodon is an extinct species of giant shark that lived approximately 28 to 1.5 million years ago. Thanks to its incredible length of up to 60 feet, it is considered one of the largest and most powerful predators that ever lived on the Earth. Distributed worldwide, Megalodon looked like a much larger and terrifying version of modern great white shark.
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Short-faced bear

The Short-faced bear is an extinct bear genus that inhabited North America during the Pleistocene epoch until 11,000 years ago, which makes him one of the “most recent“creatures of the list. Its size, however, is pre-historic indeed. Standing on its hind legs, it was up to 12 feet tall with 14 feet vertical arm reach. The short-faced bear is estimated to have weighed over 3,000 pounds.
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Native to the Upper Carboniferous (340 to 280 million years ago) of what is now North America and Scotland, Arthropleura was the largest known land invertebrate species of all time. Despite its immense length of up to almost 9 feet and earlier popular beliefs, Arthropleura was not a predator but an herbivorous arthropod feeding on rotting forest plants.
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The name Hallucigenia comes from the idea that these creatures are extremely bizarre and have a dream-like quality to them, much like a hallucination. The worm-like creature was from 0.5-3cm long with a head that didn’t include most sensory organs such as the eyes and nose. Instead the Hallucigenia had seven pincer-tipped tentacles on each side of its body, and then three pairs of tentacles behind those. To say that this creature is bizarre, would be an understatement.
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With a wingspan of up to an incredible 40 feet, this giant pterosaur was the largest creature ever to fly, modern birds included. However, the size and mass estimates for these huge beasts are extremely problematic because no existing species share a similar size or body plan, and in consequence published results vary widely. One of the distinctive features common to all the specimens is an unusually long, stiffened neck.
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Native to North and South America during the Pleistocene epoch (2.5 million – 10,000 years ago), Smilodon is the best known example of saber-toothed cats. It was a robustly built predator with particularly well-developed forelimbs and exceptionally long and sharp upper Cannes. The largest species could weigh as much as 900 pounds.
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Bigger than the T-rex the Spinosaurus is the largest carnivorous dinosaur of all times. Growing up to 18 meters long and weighing up to 10 tons, the Spinosaurus ate tons of fish, turtles, and even other dinosaurs. If this horror lived today, we probably wouldn’t.
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Living in the Late Devonian period, about 380–360 million years ago, Dunkleosteus was a large hyper-carnivorous fish. Thanks to its terrifying size reaching up to 33 feet and weight of almost 4 tons, it was the apex predator of its time. The fish was heavily armored, which made it relatively slow but very powerful swimmer.
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Deinosuchus is an extinct genus related to the modern crocodiles and alligators that lived 80 to 73 million years ago. Although it was far larger than any of the modern species, it generally looked the same. Measuring up to 40 feet in length, Deinosuchus had large, sharp teeth capable of killing and eating sea turtles, fish and even large dinosaurs.
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Attercopus was a genus of spider-like animals with a tail resembling that of a scorpion. For a long time, Attercopus was considered the prehistoric ancestor of modern spiders but the scientists who discovered the fossil have found a few more in recent years and have re-thought their original conclusion. It seems unlikely that Attercopus spun webs, but it may have used its silk to wrap eggs, lay draglines or construct burrow walls.
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Meganeura is a genus of extinct insects from the Carboniferous period which resemble and are related to the present-day dragonflies. With wingspans of up to 26 inches, it is one of the largest known flying insect species that ever lived on Earth. Meganeura was a predator with its diet consisted mainly of other insects and small amphibians.
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Native to probably all Cambrian seas, Anomalocaris – meaning “abnormal shrimp“ – was a genus of marine animals closely related to ancestral arthropods. Scientific research suggests that it was a predator feeding on hard-bodied sea creatures, including trilobites. They were notable especially for their unique eyes that, equipped with 30,000 lenses, are believed to be the most advanced eyes of any species of its time.
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Unlike its modern relatives, the Entelodon, was prehistoric pig-like mammal with a ravaging appatite for meat. Possibly one of the most monstrous-looking mammals ever the Entelodon stood on all fours and was almost as tall as a man. Some scientists suggest that Entelodonts were even cannibalistic. Hey, If they could eat their own, they could certainly eat you.
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One of the longest-lived pre-historical creatures (310 – 250 million years ago), Helicoprion is a genus of extinct, shark-like holocephalid fish most memorable for its spirally arranged clusters of teeth, called tooth whorls. Helicoprion may have grown up to over 13 feet long but its closest living relatives, the chimaeras can reach only 5 feet in length.
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Native to Southern Australia, Megalania was a giant lizard that became extinct as recently as just about 30,000 years ago which means the first aboriginal settlers of Australia might have encountered this creature. Scientific estimates regarding the size of the lizard vary greatly but it probably could have been about 25 feet long which would make Megalania the largest terrestrial lizard known to have ever existed.
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Mind Blowing Extinct Creatures You’ll Be Glad Don’t Exist

We often hear that more and more animal species have been critically endangered and their extinction is just a matter of time. Ruthless human expansion, hunting, destroying natural habitats, climate changes and other factors have are contributing to a species loss rate 1,000 times greater than the natural background rate. Though sad, sometimes extinction can be beneficial for a particular race of species…ours! From 42-feet long mega snakes to Giraffe sized flying creatures, check out these 25 mind blowing extinct creatures you’ll be glad don’t exist.

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list by Milena
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