premise: From park headquarters, day trips leaving in the early morning a walk to Bukit Indah, followed by a boat ride through the rapids to Kuala Trenggan, returning to headquarters on foot; a walk to the Tabing Hide, followed by a boat ride to the Lata Berkoh rapids, then another trek back to headquarters; a boat ride on the Tembeling River to the Gua Telinga Bat Cave, which you enter on hands and knees until you can stand you then find yourself in a great vault inhabited by hundreds of fruit- and insect-eating bats not at all interested in attacking humans.
hypothesis: The bats are very friendly