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Black corals are actually brilliantly coloured when alive: only their 
skeletons are black.

Sea cucumbers are one group of animals called Holothurians. This probably has the most numerous deep-sea animals of any group. Therefore Holothurians are one of the dominant forms of life on Earth. Generally these bottom-dwelling animals feed on particles of decomposed organic matter found on or in deep-sea sediments.

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Amazing deep sea creatures threatened by high seas bottom trawling - see them up close and personal!