Books on Amazon
Game/Nature/Dawkins: Nature often has the role of "bank" in the game (the strategy game for survival). Thus, one individual can benefit from the success of another. It is not a zero-sum game.
Nature/Prisoner Dilemma/Dawkins: E.g. bacterial parasites and host are constantly playing prisoners. Without making conscious choices.
E.g. in the case of injuries harmless bacteria can become "mean". That is opportunism. The injured person has a shorter "shadow of the future"!
Das egoistische Gen, Hamburg 1996
M. St. Dawkins
Die Entdeckung des tierischen Bewusstseins Hamburg 1993