Every wonder what the tallest dinosaur is at Dinosaur World? It's the Ultrasaurus! It was estimated to be about 82-100+ feet long, about 50 feet high, weighing 55 to 130 tons. Only a shoulder blade (scapula), some vertebrae, and a partial hip have been found. Some scientests believe that these fossils may be bits of a huge Brachiosaurus and a Supersaurus instead of a new species. So there is some controversy that there is actually an Ultrasaurus. But you can see one at Dinosaur World!