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Chickens prefer beautiful humans


We trained chickens to react to an average human female face but not to an average male face (or vice versa). In a subsequent test, the animals showed preferences for faces consistent with human sexual preferences (obtained from university students). This suggests that human preferences arise from general properties of nervous systems, rather than from face-specific adaptations. We discuss this result in the light of current debate on the meaning of sexual signals and suggest further tests of existing hypotheses about the origin of sexual preferences.

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  • Andersson, M. 1994 Sexual Selection. Princeton, New Jersey: Princeton University Press.

    Google Scholar 

  • Buss, D. M. 1999 Evolutionary Psychology: The New Science of the Mind. Boston: Allyn and Bacon.

    Google Scholar 

  • Cunningham, M. R. 1986 Measuring the Physical in Physical Attractiveness: Quasi-experiments on the Sociobiology of Female Facial Beauty. Journal of Personality and Social Psychology 50:925–935.

    Article  Google Scholar 

  • Enquist, M., and A. Arak 1998 Neural Representation and the Evolution of Signal Form. In Cognitive Ethology, R. Dukas, ed. Pp. 1–420. Chicago: University of Chicago Press.

    Google Scholar 

  • Enquist, M., S. Ghirlanda, D. Lundqvist, and C.-A. Wachtmeister 2002 An Ethological Theory of Attractiveness. In Facial Attractiveness: Evolutionary, Cognitive, and Social Perspectives, G. Rhodes and L. A. Zebrowitz, eds. Pp. 127–151. Advances in Visual Cognition, Vol. 1. Westport, Connecticut: Ablex.

    Google Scholar 

  • Gillen, B. 1981 Physical Attractiveness: A Determinant of Two Types of Goodness. Personality and Social Psychology Bulletin 7:277–281.

    Article  Google Scholar 

  • Keating, C. 1985 Gender and the Physiognomy of Dominance and Attractiveness. Social Psychology Quarterly 48:61–70.

    Article  Google Scholar 

  • Kobayashi, T. 1999 Do Mynahs Prefer Peacock Feathers of More Regular Pattern? Ornis Svecica 9:59–64.

    Google Scholar 

  • Mackintosh, N. 1974 The Psychology of Animal Learning. London: Academic Press.

    Google Scholar 

  • Palmer, A. R., and C. Strobeck 1997 Fluctuating Asymmetry and Developmental Stability: Heritability of Observable Variation vs. Heritability of Inferred Cause. Journal of Evolutionary Biology 10:39–49.

    Article  Google Scholar 

  • Perrett, D., K. Lee, I. Penton-Voak, D. Rowland, S. Yoshikawa, D. Burt, S. Henzi, D. Castles, and S. Akamatsu 1998 Effects of Sexual Dimorphism on Facial Attractiveness. Nature 394:884–887.

    Article  Google Scholar 

  • Purtle, R. B. 1973 Peak Shift: A Review. Psychological Bulletin 80:408–421.

    Article  Google Scholar 

  • Rhodes, G., C. Hickford, and L. Jeffery 2000 Sex-typicality and Attractiveness: Are Supermale and Superfemale Faces Super-attractive? British Journal of Psychology 91:125–140.

    Article  Google Scholar 

  • Ryan, M. 1998 Sexual Selection, Receiver Bias, and the Evolution of Sex Differences. Science 281:1999–2003.

    Article  Google Scholar 

  • Thornhill, R., and S. W. Gangestad 1999 Facial Attractiveness. Trends in Cognitive Sciences 3:452–460.

    Article  Google Scholar 

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Correspondence to Stefano Ghirlanda.

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Stefano Ghirlanda recently defended his Ph.D. thesis, “Towards a Theory of Stimulus Control,” dealing with widespread behavioral phenomena such as generalization and learning, in both animals and humans. His other research interests include the evolution of communication systems and the role of behavior mechanisms in social evolution.

Liselotte Jansson is a Ph.D. student developing empirical techniques to test theories about the evolution of communication using live animals. Her current projects seek to investigate the emergence during evolution of common characteristics of visual signals such as symmetry and saturated colors. Her empirical studies also include research on cognitive development in preschool children.

Magnus Enquist, professor of ethology, has worked to understand the evolution of social behavior in animals, especially with respect to aggressive communication and sexual selection. He has an increasing interest in human social behavior, particularly in applying our knowledge of biological evolution to humans without neglecting the peculiarities of the species.

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Ghirlanda, S., Jansson, L. & Enquist, M. Chickens prefer beautiful humans. Hum Nat 13, 383–389 (2002).

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