Seismosaurus

The Seismosaurus was a type of sauropod dinosaur. It was one of the largest animals to live on Earth, being over 120 feet in length and over 140 tons. They were a dull grey-green in colour. They lived in massive herds of hundreds of individuals, migrating in order to find enough food to survive on. The seismosaurus lived during the Late Jurassic period.

The seismosaurus was one of the species that the Silurians brought back from extinction after they took over in a parallel world. Herds of seismosaurus would roam free in the jungles of England. The Doctor and Ace used a herd of seismosaurus to escape from Silurian hunters by hiding in the middle of it. (NA: Blood Heat)