In ecology, commensalism's a class of relationship between two organisms where one organism benefits but the other's unaffected. There're two other types of association: mutualism (where both organisms benefit) and parasitism (one organsim benefits and the other one's harmed). Commensalism derives from the English word, meaning "sharing of food" in human social interaction, which in turn derives from the Latin com mensa, meaning "sharing a table". An example of commensalism would be birds follo… (More on Phoresy)