In a 2004 Swedish study titled “Chickens prefer beautiful humans”, human faces were photographed and digitized. The photographs were presented to undergraduates, who then rated them according to attractiveness. The male faces were rated by female students and vice versa. They came up with a gradation of the most and least attractive. Then chickens were presented with the same faces and strikingly, the chickens’ preferences in binary choices showed a 98% overlap with the humans’ ratings.