are there any megalodon skeletons?
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1: Megalodon went extinct about 2.6 million years ago. Shark skeletons are made mostly of cartilage, but teeth and vertebrae of megalodon are widespread in the fossil record. This evidence shows they lived in our oceans from about 20 million years ago to about 3 million years ago.
1254696
Early estimates of 300-year lifespans for the largest sauropods were based on comparisons with crocodiles and turtles, which have much slower metabolisms. The consensus is now that Apatosaurus and Diplodocus dinosaurs probably only lived for 70 or 80 years, which is about the same as an elephant today.
831287
Or were they asymmetrical to begin with? Although many coelacanth fossils have been found, none preserved the crucial details of the fin skeletons, probably because these were largely made of cartilage – which is hardly ever preserved.
991520
By consuming the bones of plesiosaurs, mosasaurs and other big marine animals when they died, Osedax worms quite literally ate their fossil record. Whales are enormous creatures. Usually, an adult whale has very little to fear in the way of predators, especially the biggest of the giants.
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Many prehistoric animal groups are popularly conceived of as dinosaurs, such as ichthyosaurs, mosasaurs, plesiosaurs, pterosaurs, and pelycosaurs (especially Dimetrodon), but are not classified scientifically as dinosaurs, and none had the erect hind limb posture characteristic of true dinosaurs.
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['Carnotaurus. [02:46]', 'Pentaceratops. [03:57]', 'Indominus rex. [07:00]', 'Allosaurus. [10:47]', 'Deinonychus. [14:08]', 'Brachiosaurus. [14:52]', 'Spinosaurus. [16:56]']
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['Juvenile American alligators. Ianare Sevi, Wikimedia Project.', 'Nile monitor lizard. Patrick Lynch, South Florida Water Management District (2007)', 'Giant Argentine tegu. ... ', 'Black spiny-tailed iguana. ... ', 'Figure 5.']
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Are Giant Ground Sloths Still Alive Today? No. Palentologists say giant ground sloths such as Megatherium died off thousands of years ago, at the end of the last ice age. Many large, prehistoric creatures disappeared from North and South American around the same time.
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If you grew up loving Brontosaurus only to be told it wasn't a real dinosaur, it's time to rejoice: the gentle giant may have received a new lease on life. The giant sauropod, long thought to be an Apatosaurus that someone got wrong, was actually its own type of dinosaur all along, scientists say Tuesday in PeerJ.
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['North American horses.', 'Glyptodon.', 'Mastodons.', 'Mammoths.', 'Short-faced bear.', 'Dire wolf.', 'American cheetah.', 'Ground sloth.']
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['Tarbosaurus. [02:09]', 'Alice Andesaurus. [02:30]', 'Allosaurus. [03:13]', 'Tyrannosaurus Rex Gen. [03:29]', 'Tyrannosaurus Rex. [04:04]']
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It can be observed that most abelisaurids sported these thick bony projections atop their heads. So yes, predators often have horn/horn-like projections on their skulls.
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Chameleons and agamid lizards, such as bearded dragons and water dragons, possess acrodont dentition. Acrodont teeth are easily lost and are not replaced. Instead as teeth wear, the biting surface eventually becomes the bone itself.
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Natural enemies of Ankylosaurus were carnivorous dinosaurs such as Tyrannosaurus, Tarbosaurus and Deinonychus. Modern animals such as crocodiles and armadillos have same type of bony plates on the body, which play exactly the same role - protect the body against the predators.
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['Carnotaurus.', 'Death Worm.', 'Fire Wyvern.', 'Leedsichthys.', 'Megalodon.', 'Mosasaurus.', 'Raptor.', 'Tusoteuthis.']
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Both animals also have short, stubby legs and soft, unprotected bellies. However, the glyptodon was far larger than any modern armadillo. A glyptodon was approximately the size and mass of a Volkswagen Beetle, while the largest armadillos are only about 3 feet long and weigh less than 150 pounds.
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1. The oarfish is the world's longest bony fish. The giant oarfish (Regalecus glesne) was first described in 1772, but it has been rarely seen because it lives at considerable depths. ... Some people also call them ribbonfish because of their body form.