Definition: Mutualism is a relationship between two kinds of organisms that benefits both of them.
Ex:The Nile Crocodile benefits from the Egyptian Plover bird that eats pieces of meat from its teeth. The bird gets food, and the crocodile gets its teeth cleaned.
Ex:A shark depends on a shark sucker to clean ectoparasites from its skin, the sucker fish gets food.
Ex: A clownfish gets protection from predators by living in a sea anemone, and it helps the anemone by luring prey to it, and eating the dead tentacles.