Torosaurus was a species of ceratopsid dinosaur that lived during the Late Cretaceous period. The most well known type of ceratopsid is the three horned Triceratiops. Itís was thought that actually Triceratops was the juvenile of Torosaurus and they were the same species with Torosaurus being the Triceratops in full maturity but this is still debated, with a recent study in 2012 concluding that Torosaurus and Triceratops were two different species of Ceratopsidae.