Therizinosaurus, in reality, were herbivores and/or opportunistic omnivores with a longer neck and bigger size than the ones seen in Dino Crisis. One theory regarding the inaccuracy is that the dinosaurs in the game were young Therizinosaurus, and in that epoch of their lives, their necks didn't grow long enough. An adult Therizinosaurs grew up to 40 feet long. They had long claws (that were about the length of the average human arm) like their in-game counterparts. Therizinosaurus lived in late Cretaceous period on the Asia continent. Its fossils were discovered in Mongolia and China.