' They were the giants of all giants that roamed the earth for a period of 135 million years. Dinosaurs wreaked havoc and fear upon each other during their time. The biggest of all, the sauropod, grew to estimated lengths of close to 200 feet and a height of 30 feet. These are some of the most incredulous sized animals that ever walked the earth. Some of them though are not considered giants in size. In fact, some of the smaller kind looks much scarier than the humongous ones. Here are some of the scariest dinosaurs that ever lived.
