 At the end of that novel Tarzan learns that her death was a ruse, that she had not been killed at all.In attempting to track Jane, Tarzan has come to a hidden valley called Pal-ul-don filled with dinosaurs, notably the savage Triceratops-like Gryfs, which, unlike their prehistoric counterparts, are omnivorous and stand 20 feet tall at the shoulder.The lost valley is also home to two different adversarial races of tailed human-looking creatures