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The oldest dinosaur rocks in Argentina and Brazil, and are about 230 million years old. The early dinosaurs were small, but very agile.
They were meat eaters, and the fact that they could move quickly on two legs gave them a great advantage over other creatures of the period.The stegosaurus was a plant eating dinosaur that moved very slowly. Luckily, it had rows of bony plates on its back and tail for protection from meat eating dinosaurs. However, sometimes this protection was not enough, especially against the tyrannosaurus which was the fiercest meat eater dinosaur ever known. This monster was 46 feet long, 18 feet high and had sharp seven-inch teeth.
It could run at 40 miles per hour, and when it caught its prey, it snapped its victim's backbone with just one bite!
                Reptiles are the first back boned animals ever to live entirely on land.The meganeura was a dragonfly-like insects that lived during the late part of the palaezoic Era, during the carboniferous permian periods. Meganeura means 'large veins', and the name refers to the thick network of veins which supported this insect's huge wings like a skeleton.The meganeura was the largest known flying insect species ever to appear on earth.
                              

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