ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Giant sea cucumber (Thelenota anax) on the seabed. Only part of the sea cucumber is seen. The sea cucumber is an echinoderm, related to starfish and sea urchins. It feeds on detritus from the sea floor using tube feet around its mouth. When startled by predators it can confuse them by expelling its internal organs, which it then regrows. This sea cucumber can reach more than a metre in length.
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