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Coral reefs are all about symbiosis - the art of living together. When we look at an underwater scene like this one, we tend to focus on the brilliant blue fish *Chromis viridis*, or the blue *Acropora* coral, or perhaps the *Dasyatis* stingray in the sand. We see them all as separate, individual creatures. But they are, even as we watch, a collective being, and owe their very existence to mutually beneficial actions.
