Symbiosis is an interaction between two different organisms living in close physical association. The three types of symbiosis are mutualism, commensalism, and parasitism.
Mutualism is the way two organisms of different species exist in a relationship in which both benefit from each other. One example of a mutualistic relationship is that of the oxpecker (a kind of bird) and the rhinoceros or zebra. Oxpeckers get food and the beasts get pest control.
Other Examples of Symbiosis
One example of mutualism is the relationship between the bee and the flower. Bees fly from flower to flower gathering nectar, which they make into food. When they land on a flower, the bees collect pollen on their bodies. As they travel from flower to flower, they leave some of the pollen on the flowers and pollinate them, so they can reproduce.
One example of commensalism is the relationship between a clownfish and an anemone. The clownfish lives in the tentacles of the anemone, which protects them from predators. It has a poison that the clown fish are acclimated to. The clown fish gets a home with protection, and the sea anemone is not affected.
One example of parasitism is the relationship between a flea (parasite) and a dog (host). The flea bites the dog's skin and sucks its blood. Not only is it getting food and nutrients from the dog, but also a warm home and transportation to possibly another host. The dog loses blood, becomes very itchy, and can contract diseases from the fleas.