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A dinosaur is a prehistoric reptile. Most were know to be herbivores. They lived during the Triassic period 200-250 million years ago. Dinosaur means great lizard. Scientist believe some dinosaurs evolved into modern birds because, they share a common ancestor.

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Studies have proven that all dinosaurs hatched from eggs. Dinosaurs would travel to breeding grounds where they would lay clutches of eggs.  The mothers were believed to be extremely protective over their nests. It is still uncertain if all the dinosaurs guarded their nested or left after laying. Recent fossils have provided evidence that after hatching the young traveled in groups to find their mothers.

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There are many species of dinosaurs that have been discovered through fossils. The most common are the Triceratops and Tyrannosaurus rex. The Triceratops was a large herbivore and the T-rex was a very large carnivore. Triceratops were believed to travel in groups. Meanwhile the Tyrannosaurus rex was a solo hunter.

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Dinosaurs went extinct approximately 65 million years ago.  Most died due to the huge meteorite that crashed on earth. Disease also killed out a lot of dinosaurs. Those two factors caused the rest to die of starvation. However, scientists believe non-avian dinosaurs evolved into modern day birds.

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it has recently been discovered that dinosaurs bone consisted of growth rings. These rings are similar to a trees bark. Each ring represents a year.

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The Tyrannosaurus rex along with many other carnivores were bipedal. Meaning they walked with two legs. This built helped them move quicker to catch prey. Most of the herbivores like the sauropod dinosaur moved on all four legs. It made grazing and long travels easier for them to handle.

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Most were herbivores.
Paleontologists discovered fossils that contained evidence that large leafy plants and evergreen tree existed during the dinosaur ages. Carnivores fed on the herbivores to control the population from getting to large. Velociraptors were pack hunters that stalked and killed prey. The T-rex traveled alone when hunting.

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It is believed that dinosaurs mated internally. However, the embryo developed externally inside an egg. Evidence suggest a cloaca had to be present in dinosaurs. Visual and vocal behaviors is what helped to attract mates. Three to six months is how long it was believed for the embryos to hatch out.

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Dinosaurs evolved from reptiles and later evolved into birds. Reptiles are known to be cold blooded while birds are warm blooded. Recently, the heart from a herbivore dinosaur was discovered. It had four pumps. This proves that some maybe not all were warmblooded.

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All seven continents contained dinosaur fossils. Many thrived along the sides of ancient rivers and streams. Herbivores felt safer when in open plains because, they could escape for predators easier. Forrest was also a thriving habitat for them. Carnivores used the forest to sneak up an attack prey.