Brittle stars

For locomotion, brittle stars use their arms.

Arms are elastic and allow the brittle star to move relatively fast. Four of five arms are used for locomotion with an extra arm being the symmetry axis.  Contrary to starfish, brittle stars use tube feet for transporting food to mouth, respiration and sensing, not to locomotion as they are not equipped with suction cups.

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Read the entire article 26 facts about Brittle stars, from which this fragment is taken.