We sought to test the hypothesis that the Dark Triad traits are condition-dependent responses to a particular set of socioecological conditions in childhood. In three cross-sectional studies (N ¼ 1,403), we examined how the Dark Triad traits were correlated with measures of resource availability, harshness, and unpredictability in one's childhood and adulthood. The Dark Triad traits were correlated with self-reports of an unpredictable childhood when using both the Short Dark Triad and the

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... Dozen measures. These effects were somewhat stronger in men than in women and were replicable across samples. We also replicated sex differences in the Dark Triad traits but found none for our measures of socioecological conditions. Results are discussed in terms of the recurrent unpredictability in evolutionary history necessitating the sensitivity and responsiveness to such features to enable survival and reproduction. We contend that the Dark Triad traits might be condition-sensitive adaptations to socioecological unpredictability that all people could have if properly motivated.