They trolled the earth during the late Jurassic period. Allosauruses lived about 155 million years ago. The name translates to ‘different lizard’. It’s a reptile that is classified in the ‘Allosauridae’ family. Its’ sharp teeth tears through tough preys with ease. It stretches to a length of 9 meters. Experts say the longest they could grow is 12 meters. They have good balance and force of gravity because of its’ heavy tail.