Apparently, archaeologists were amazed when discovered during the excavation huge dinosaur bones. Now we know: many lizards were innocent animal animals that lived peacefully in the woods, eating grass. Some dinosaurs were sizes from a whole tennis court, others are small as a chicken. In some people the skin was smooth, but in others it was covered with scales, but it was generally a horny shell, protecting the body. In addition, some outbreaks had horns or spines. We know about 600 varieties of dinosaurs.