Intimate living together of two organisms (called symbionts) of different species, for mutual or one-sided benefit. A good example of mutually beneficial symbiosis is the clownfish and the sea anemone. The clownfish can come in contact with the stinging tentacles of the sea anemone and not be harmed by them. At the same time, it receives protection from its enemies. The clownfish feeds the anemone by gathering nutrients and also leaving nutritional waste on the tentacles.