Sea stars can regenerate a lost arm.
© Blue Ocean Society
Amazingly, sea stars can regenerate lost arms. This is useful if the sea star is threatened by a predator - it can drop an arm, get away and grow a new arm. Sea stars house most of their vital organs in their arms, so some can even regenerate an entirely new sea star from just one arm and a portion of the star's central disc. It won't happen too quickly, though. It takes about a year for an arm to grow back.
Sea stars are protected by armor.
© Blue Ocean Society
Depending on the species, a sea star's skin may feel leathery, or slightly prickly. Sea stars have a tough covering on their upper side, which is made up of plates of calcium carbonate with tiny spines on their surface. A sea star's spines are used for protection from predators, which include birds, fish and sea otters.
http://marinelife.about.com/od/invertebrates/tp/seastarfacts.htm
HAVE A LOOK AT THESE http://www.youtube.com/watch?v=f7cXeWxxfD4#!
http://www.youtube.com/watch?v=d5dOSyaKWTQ
Its a video in California about star fish limb regeneration!
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