At the same time, other dinosaurs moved quietly on the ground, one of them - Allosaurus - was a 10-

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Scientists suggest that dinosaurs appeared about 180 million years ago and became extinct about 60 million years ago. Since dinosaurs were reptiles, they were to be held from reptiles that lived before them. Reptiles, among other things, a separate class of animals, which are characterized by the following: neteplokrovnye they can live on land, have a kind heart and most of them are covered with scales.
The first reptiles appeared long before the dinosaurs. They looked like amphibians (can live both in water and on land). But the eggs postponed only on the ground. Cubs have the legs and lungs and can breathe air, possibly fed on insects.
Then, reptiles were becoming bigger and stronger. Some looked like large lizards, others - turtles. They had short tails, thick legs and large heads. They ate plants. The first dinosaurs were similar to their ancestors - reptiles, lizards, and who looked like he could walk on its hind legs. The first dinosaurs were small, avant garde fashion with about turkey, and could also walk on their hind legs. Some were so small, but others grew heavier avant garde fashion and longer. At one time many of them were 2.5 m in length. There were even a few 6-meter that weighed like an elephant. They had small heads and short blunt teeth, which were good only for chewing plant foods. They lived in low, swampy ground.
Then came another period avant garde fashion of centuries reptiles. Some herbivorous dinosaurs became so large that even four legs could not keep himself on the ground. They began to spend most of their time in rivers and swamps. One of these giants called Brontosaurus, 20-24 meters in length, weighing about 34 tons.
At the same time, other dinosaurs moved quietly on the ground, one of them - Allosaurus - was a 10-meter, had sharp teeth and claws and ate Brontosaurus and other herbivores. So dinosaurs were a stage in the development of reptiles. They disappeared because of climate change avant garde fashion on Earth, stripped of their habitat and food.
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