The arms, in most cases, are triangular in shape. One of the most interesting characteristics of the sea star is its ability to regrow a severed arm. Each arm is lined with tiny feet that are tipped with small suction cups. The sea star uses them to move and to capture prey. While sea stars have delighted many beachcombers along our shores, some fishermen don't look upon them so kindly.
Sea stars can wreck havoc on oyster beds and on other shellfish populations.
Ironically, the sea star's mouth is about a quarter of an inch in diameter and as a result, it cannot take in large bites of food. Therefore, it has found unique ways to eat. It pushes its stomach out through its mouth and wraps it around its prey. Clams and mussels can be digested alive this way. While the sea star may seem invincible, it is completely defenseless against certain predators.