Clownfish and anemone display a remarkable symbiosis. While the anemone gives cover to the clownfish from predators, the clownfish rids the anemone of parasties. The anemone also picks nutrients from the clownfish's nitrogenous excrement. The activity of clownfish has also been found to cause better water circulation around the anemone.
The cartoon appeared on my Gocomics page last month.