The limestone hill is also the only known site for the endangered land snail Plectostoma mirabile.

Twice a year, from February to April and July to September, locals with licenses climb to the roof of the caves, using only rattan ladders, ropes, and bamboo poles, and collect the nests.

The first collection takes place early in the breeding season before the swiftlets lay their eggs.

The cave system is home to many other animals, including massive populations of cockroaches, centipedes and bats.

Outside one can see many raptors including crested serpent eagles,[7] kingfishers, and Asian fairy-bluebirds.

It is where the more valuable "white saliva" nests of the swiftlets are found, and is reached by a steep, 30-minute climb further up the mountains.