Mutualism is a kind of symbiotic relationship by which each collaborating species profit from the interplay. Mutualistic interactions are widespread in nature, and will be present in all kinds of habitats.
One widespread instance of mutualism is the connection between ants and acacia timber. Ants dwell within the hole thorns of acacia timber, and in return for this safety, they defend the timber from herbivores. One other instance of mutualism is the connection between clownfish and anemones. Clownfish dwell among the many tentacles of anemones, which offer them with safety from predators. In return, the clownfish assist to scrub the anemones of particles.