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Dinosaurs are groups of reptiles, scientifically known as Dinosauria and belonging to phylum chordata.  Dinosaurs go way back to the Triassic period, nearly 243 million years ago!

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Each dinosaur had different features that allowed them to strive in different environments. Some grew larger, some began to walk on four legs, and others grew into different shapes. Each new feature, a long neck or sharp teeth, or bony plates, if it helped the animal survive, was passed on to later generations. These features became the hallmark of each new kind of dinosaur

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Earlier scientist estimated the dinosaur to have a 300-year lifespan, basing their estimates on comparisons with crocodiles and turtles. whose metabolism is much slower. Now day scientist say that the average dinosaur probably only lived 70-80 years.

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Dinosaurs breathed using partitioned lungs. In some dinosaurs, these were fully split into a gas-exchanging lung and ventilatory air sacs.

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Most of the dinosaurs that have been found lived along ancient rivers or streams and roamed across the adjacent forested floodplains and densely vegetated swamps and lakes. Some discoveries have also shown that dinosaurs inhabited ancient deserts strewn with fields of sand dunes.

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Most skin fossils show bumpy skin, not scaly skin; only the huge plant-eaters seem to have had scaly skin. Some of the bird-like dinosaurs had protofeathers (a type of modified scale).

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Most dinosaurs had grinding teeth or nipping teeth for eating plants. Meat-eaters had steak knife-like teeth with grooves to help them cut their meat.

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The average dinosaur was as big as your car. The biggest dinosaur bones, like the hips of supersaurus, were eight feet wide.  Dreadnoughts, the largest dinosaur, was 26 metres (85 feet) long and weighed about 65 tons.

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Geological evidence indicates that dinosaurs became extinct at the boundary between the Cretaceous and Paleogene eras, about 66 million years ago, at a time when there was worldwide environmental change resulting from the impact of a large celestial object with the Earth and/or from vast volcanic eruptions.

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Dinosaurs have reduced fourth and fifth digits on their hands, their feet have three large toes, they have three or more vertebrae composing the sacrum, and have an open hip socket (a three-bone structure).