Deer Cave, Mulu National Park, Sarawak, island of Borneo, Malaysia (@ Richard Ashworth/Photolibrary)

Deer Cave, Mulu National Park, Sarawak, island of Borneo, Malaysia (@ Richard Ashworth/Photolibrary)

comments,

• This cave got its name from the animals that come to lick its salty rocks.""See inside the world\s second-largest known cave passage
• Millions of bats live in these depths and when they all go out for a snack it is quite the spectacle.""Watch them all go on a pre-dinner dance
• The amazing caves and karsts that fill this national park have been creating incredible sights here for five million years.""Where is this amazing place?
• If you fancy releasing your inner troglodyte but can\t afford the trip out this far then help is at hand.""Try exploring one of the UK\s many great caves and join a potholing club