Commensalism

http://en.wikipedia.org/wiki/
Commensalism is a symbiotic relationship. It is one out of three types of symbiotic relationships. Commensalism is a kind of symbiotic relationship that one thing benefits from and the other doesn't, such as a bird and a bush. A bird lives in a bush and the bush provides the bird with shelter so the bush doesn't benefit anything out of situation. You can find this relationship anywhere, for instance just look in your back yard and look at a tree or in a bush and you are most likely to find a bird living in it. In my opinion, I think commensalism is important because if the bird doesn't have anywhere to live they won't have a place to protect their children and would probably die.