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Sea Urchins and Brittle Stars

In between the spines of a sea urchin are tiny venomous claws that defend the animal from attack. The claws can  smell predators and they are not controlled by the urchin's nervous system  (they have a mind of their own).
      
            Pencil Urchin                                            Sand Dollar                             Diadema Urchin                              Lance Urchin                         Long-Spined Sea Urchin