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Cave of the Black Dragon, Gunung Mulu National Park.

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The Gunung Mulu National Park lies just below the equator in Borneo, in Malaysia.

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The park covers 530 square kilometres of tropical rainforest.

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The jungle teems with plant and animal species.

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This Latin fly's mottled colouring protects it from predators.

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The birdwing butterfly is a symbol of Malaysia.

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The creatures have adapted to this environment.

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This tree appears hollow. A parasitic fig entwined itself around another tree.

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The tree died and this is the result.

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Vast limestone caves extend beneath the forest.

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It is one of the largest and longest set of caves in the world.

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Heavy tropical rains carve them out of the stone.

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The caves are home to a creature that supports a whole ecosystem in Gunung Mulu.

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The fawn roundleaf bat is Borneo's most common bat species.

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A species of centipede also lives here.

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When in danger, it leaves a fluorescent liquid and scuttles away.

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It rains continually in Borneo's rainforest.

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Once the rain ceases, the bats inside the cave awake and fly out together.

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There are more than three million of them.

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They are called the black dragon, a term of awe and respect.

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The bats fly around preying on insects. The dance can last more than 30 minutes.

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Their natural enemy is the hawk.

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The shape of the black dragon disperses as it defends the bats form a circle to scare the hawk away.

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Gunung Mulu, with its enormous caves below and a vast tropical rainforest above,

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hums with life and mystery.