31 CAVE ECOSYSTEM. This irregular cave is naturally lighted by the presence of phosphorescent lichen and fungi on the ceiling and walls. Ceiling height varies between six and eight feet. Thousands of flightless, hairless pink bats crawl across the ceiling, eating the plant material and small insect life found therein. Several dry shelves are here, upon which blue-shelled miniature turtles rest. The water contains creepy but harmless black worms, measuring between six inches and three feet in length and wide around as a quarterstaff.