John Pearse studied sea stars in the intertidal for a long time and assumed they had no social interactions. Then he met long-time diver Don Wobber who has a passion for sea stars. He wondered about the sea stars poses revealed in his videos. Using a time-lapse camera, Wobber found his answer: sea stars do interact with each other. Wobber shared his video with Pearse who was amazed at the complex social behaviors.
John Pearse, Don Wobber, Biologists: Sea Star Behavior
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One of the really fascinating things about echinoderms is that they don't seem to grow old. They can live forever. The only thing that kills a sea star is physical harm or disease. Some sea stars can regenerate their whole body from one part of the ray. How do they do that? -- John Pearse