One will see in several tour guides and maps of Boracay something called the Bat Cave, which houses many small insectivorous bats (the larger fruit bats roost in the trees on the hillside above Punta Bunga Beach), and locals will be more than happy to accompany you there for a fee, or "tip". The cave is on the western-end of the island and down several dirt roads. The guide will then take you on a short hike through the forest to the mouth of a cave, which drops down at a very steep angle. The mouth of the cave is littered with large boulders, and is extremely difficult to enter and walk down. There is no visible path, no handrail, and the stones are extremely slippery with slime and bat guano, as well as extremely dangerous, since the cave is at such an extreme angle. Also, the air inside the cave is very warm and humid, and in addition to the amount of guano, is very difficult to breathe. Additionally, several snakes live inside the cave. Caution should be taken by those visiting and entering the cave. There are bats in the cave, but down at the bottom of it in the dark, and unless you have a flashlight or are there at dusk, you won't see them. The ceiling of the cave is interesting, however, with multiple, small stalactites. Just nearby, you can find another cave, called "crystal" cave which has a lot of stalactites and a hole on the opposite site of the entrance, from which you can watch out to the sea if you dare to climb up to it. You will have to pay ₱50 entry-fee to visit both caves on behalf of the family that owns the land, in addition to paying your guide. Visiting both caves can cost up to ₱2500 for the guide, but this is the "rich tourist price", so try to bargain if you like.