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I am interested in primate behavioral ecology and the adaptive significance of social relationships. My research has focused on mate choice, dominance rank acquisition and maintenance, the role of signaling in social relationships, methodological issues involved in measuring the quality of social relationships, and interactions between evolved psychology and environmental novelty in nonhuman primates. I have done fieldwork on free-ranging rhesus macaques, and I maintain an ongoing field project on wild capuchin monkeys. My current specific interests are infant handling and lethal aggression.