Clownfish have a thick coating of mucus that protects them from the sea anemone’s potentially deadly sting. Living in the anemone provides the clownfish protection from possible predators and food scraps from the anemone’s leftover meals. In return, the clownfish provides protection from some predators, removes dead tissue and parasites, and by swimming, keeps the anemone ventilated.
Sea anemones are found throughout the world’s oceans. Although the most abundant and diverse populations are found in shallow tropical waters, some species of anemones can live at depths more than 10,000 meters below sea level.