Although some scientists consider Torosaurus to be the same as Triceratops, it has remained it's own species. This 20-23 foot long, 2.5-3.5 ton herbivore, has one of the largest skulls of any land animal. It's up to 8 feet long in an adult! It's large brow horns are over 3 feet in length. Torosaurus lived about 70 million years ago in North America.