Supersaurus was a dinosaur of gigantic proportions. This titan reached lengths of some 100-115 feet in length and may have weighed over 40-50 tons. Supersaurus certainly lives up to it's name with a size like that. It's so large, adults may have had no natural predators, though packs of Allosaurus or Ceratosaurus could have possibly brought one down. Supersaurus is possibly the same as "Ultrasauros," a dinosaur most scientists dubbed a junior objective synonym of Supersaurus. Supersaurus lived 150 million years ago in North America.