Jane and Roger are doing research to determine if animals have a sixth sense; the ability sense danger around them. They place weather sensors in trees and pull out their notebooks. Tarzan looks up in disbelief and explains that he does not need to determine if animals have sixth sense; he knows they have a sixth sense. Meanwhile, Dan returns to camp with a baby pig named Hamlet. He intends to keep Hamlet as a pet for a while. Later in the date, while Tarzan is examining strange cracks in the earth, a tremendous earthquake hits and he is put unconscious by a fallen tree. Suddenly, Cheetah and Hamlet race out of camp into the forest. Cheetah finds Tarzan right away and gets Tantor the elephant to help move the tree on top of Tarzan. Jane and Dan run after Hamlet and discover that the little pig has led them to Tarzan. They find that Cheetah has the situation well in hand and realize once and for all that the animals' sixth sense cannot be denied.