Sea stars, astonishingly, can regenerate lost arms, which is useful if a sea star is injured by a predator. It is capable of losing an arm, escaping, and growing a new arm later. The majority of sea stars' vital organs are housed in their arms. This means that some species can regenerate an entirely new sea star from just one arm and a portion of the central disc of an old one. This won't happen overnight; it takes about a year for an arm to regenerate.
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