This article reports that chickens agree almost 100% with humans on which human faces are the most attractive.
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.
Holy shit. I expected that attractiveness had a large objective component. What I did not expect was for it to be so objective as to not even be species-specific.