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Abstract: We experimentally investigate whether individuals can reliably detect cooperators in an anonymous decision environment by allowing participants to condition their choices in an asymmetric prisoner's dilemma and a trust game (i) on their partners' donation share to a self-selected charity, and (ii) on whether their partner belongs to a group with high or low average donations (group affiliation) . We find that high donators achieve a higher-than-average expected payoff by cooperating predominantly with other high donators. The group affiliation proved to be irrelevant. Keywords: Game theory, Conditional cooperation, Donation behavior JEL-Classification: C91, C72, D3 The authors gratefully acknowledge the help of Luciano Criscenti, Simone Ehrlinger, Rita Fleischmann, Klaudia Grossteiner, Maria Lacko and Markus Mayer who helped to run the experiment at the University of Vienna, Austria.