Of all the weird and wonderful aquatic organisms that bob about in our oceans and rivers, you would be forgiven for overlooking the hydra. Named after the Ancient Greek mythological serpent that could regrow its heads, it is a freshwater relative of jellyfish, anemones and corals. A little like a dandelion seed, with a long body and tuft of tentacles on one end, there's not much to see. But they have a remarkable property that makes them a curiosity of biology: they can regenerate. If you cut a hydra into many pieces, each bit will regrow into a complete, new individual.

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