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→Even chickens prefer sexually dimorphic human faces, to the same extent as humans
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To test the behavior that the chickens had learned, the researchers counted the times the chicken picked at a given face within a certain time interval. Interestingly, it was discovered that human and chicken preferences for opposite sex faces were very highly correlated when varying the degree of sexual dimorphism of the presented faces (r² = 0.98); that is to say nearly identical. That means the chickens were nearly equally as likely to peck at the highly dimorphic faces as the human subjects were to prefer them as potential romantic partners. This result even generalized to when the researchers added faces with even more exaggerated dimorphism not present during training, i.e. both humans and chickens agreed on the more exaggerated faces being more attractive. | To test the behavior that the chickens had learned, the researchers counted the times the chicken picked at a given face within a certain time interval. Interestingly, it was discovered that human and chicken preferences for opposite sex faces were very highly correlated when varying the degree of sexual dimorphism of the presented faces (r² = 0.98); that is to say nearly identical. That means the chickens were nearly equally as likely to peck at the highly dimorphic faces as the human subjects were to prefer them as potential romantic partners. This result even generalized to when the researchers added faces with even more exaggerated dimorphism not present during training, i.e. both humans and chickens agreed on the more exaggerated faces being more attractive. | ||
This provides evidence that any kind of sexual dimorphism tends to be exaggerated by [[sexual selection]] as it will appear are more attractive to the opposite sex (though within bounds, too much of a desirable trait also tends to reduce fitness, [[goldilocks principle]]). | |||
<span style="font-size:125%">'''Discussion:'''</span> | <span style="font-size:125%">'''Discussion:'''</span> | ||