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The amazing hydra is related to the jellyfish. Living only in clean, unpolluted waters, it can either move slowly on its "foot" or somersault end over end like a gymnast. Long tentacles surround an opening that is used for both eating and going to the bathroom. The hydra dines on meals of one-celled animals, water fleas, and seed or clam shrimp. It gets oxygen right through its skin.