# Reciprocal altruism |  | In evolutionary biology, **Reciprocal altruism** is a behaviour whereby an organism acts in a manner that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that the other organism will act in a similar manner at a later time. | |-|-| | | wikipedia:: [Reciprocal altruism](https://en.wikipedia.org/wiki/Reciprocal_altruism) | [[Altruism (ethics)|Altruism]]