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.
Scientist in this video