Nature, flora and fauna

Cynomolgus Monkey at Batu Caves

There are various undeveloped caves which contain a diverse range of cave fauna, including some unique species, such as Liphistiidae spiders and Eonycteris and Rousettus fruit bats. The site is also well known for its numerous macaque monkeys, which visitors feed — sometimes involuntarily. These monkeys may also pose a biting hazard to tourists (especially small children) as they can be quite territorial.

Below the Temple Cave is the Dark Cave, with rock formations and a number of animals found nowhere else. It is a two-kilometer network of relatively untouched caverns. Stalactites jutting from the cave's ceiling and stalagmites rising from the floor form intricate formations such as cave curtains, flow stones, cave pearls and scallops which took thousands of years to form.

In order to maintain the cave's ecology, access is restricted. The Malaysian Nature Society organises regular educational and adventure trips to the Dark Caves.