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Abstract The game Deterministic strategies Tit for tat TF2T and STFT Free Rider and Rover Escaping the IPD Observer TFT Stochastic strategies Generous TFT Pavlov A different solution: chaos Frequential chaos Spatial chaos Where is the Prisoner's Dilemma found in nature? Myrmecophily Predator inspection in fish Egg-trading in simultaneous hermaphrodites Blood-sharing in vampire bats Reciprocal altruism in primates Conclusion Acknowledgements References This review was first published as: Brembs, B. 1996. Chaos cheating and cooperation: potential solutions to the Prisoner's Dilemma. OIKOS 76: 14-24.