Mutualism is a type of symbiotic relationship in which both participating species benefit from the interaction. Mutualistic interactions are common in nature, and can be found in a wide variety of habitats.
One common example of mutualism is the relationship between ants and acacia trees. Ants live in the hollow thorns of acacia trees, and in return for this protection, they defend the trees from herbivores. Another example of mutualism is the relationship between clownfish and anemones. Clownfish live among the tentacles of anemones, which provide them with protection from predators. In return, the clownfish help to clean the anemones of debris.