They have been reported from ceratopsians, hadrosaurs and other tyrannosaurs. Skulls of some dinosaur species, including tyrannosaurs, possessed well developed sagittal crests. Local dinosaurs included Hadrosaurs, ornithomimosaurs and tyrannosaurs. Bob is also capable of possessing non-sentients, up to and including animated tyrannosaurs. She tells him the Aztecs call the Tyrannosaurs "Thunder Lizards". Tyrannosaurs dominated the large predator niche in North America. The conquistadores set out on a mission to kill the Tyrannosaurs with cannons and muskets. The bodies of tyrannosaurs exhibited huge heads and legs, in contrast to proportionally tiny arms. Chatterjee even considered poposauroids to be the ancestors of tyrannosaurs. The skull of "Suskityrannus" and its foot are more slender than other tyrannosaurs. However, Asian tyrannosaurs like "Alioramus", and "Alectrosaurus" were excluded, as was "Eotyrannus" from England. Unlike later tyrannosaurs, "Guanlong" had three long fingers on its hands. Another debate about tyrannosaurs would not be settled until the early 21st century&colon; their diet. They are separated after being chased by tyrannosaurs.