This film goes all-out with its imaginative setting and shows lots of fantastical creatures. This is a strength of the film but it also means that it doesn't really have anything to do with the prehistoric world at all. The whole time I just imagined that it was set in some post-apocalyptic wasteland where humans have engineered the entire ecology of Earth as weapons, which made it more fun to watch. The family dynamic was entertaining and there is a good message about being open-minded.