 Before "King Kong" entered production, a long tradition of jungle films existed, and, whether drama or documentary, such films (for example "Stark Mad") generally adhered to a narrative pattern that followed an explorer or scientist into the jungle to test a theory only to discover some monstrous aberration in the undergrowth.In these films, scientific knowledge could be subverted at any time, and it was this that provided the genre with its vitality, appeal, and endurance.In the early 20th century, few zoos had primate exhibits so there was popular demand to see them on film.