Twenty seven species of bat have been recorded in Gunung Mulu national park in Sarawak, Malaysia on the island of Borneo. Deer Cave (for many years considered the largest single cave passage in the world) is home to an enormous colony of Wrinkle-lipped bats (Tadarida plicata). The bats exit the cave almost every evening in search of food in a spectacular exodus. A huge mound of guano in the cave is evidence of the size of the bat colony that roosts in the cave's high ceilings.
