In physical attractiveness studies, averageness describes the physical beauty that results from averaging the facial features of people of the same gender and approximately the same age. The majority
Outline drawings of two young women's faces, and an averaged image of the two
Transcending culture: Hadza people rated averaged Hadza faces as more attractive than single faces from the tribe.
Koinophilia is an evolutionary hypothesis proposing that during sexual selection, animals preferentially seek mates with a minimum of unusual or mutant features, including functionality, appearance an
Averageness
…the sense that it is a good example of a face that is representative of the category of faces. A possible evolutionary explanation for averageness is koinophilia, in which sexually-reproducing animals seek mates with primarily average features, because extreme and uncommon features are likely to indicate…
This leucistic Indian peacock, Pavo cristatus, is unlikely to find a mate and reproduce in a natural setting due to its unusual coloration. However, its striking colour is appreciated by humans, and may be included in artificial selective breeding to produce more individuals with the leucistic phenotype.
The overwhelming impression of strict uniformity, involving all the external features of the adult members of a species, is illustrated by this herd of springbok, Antidorcas marsupialis, in the Kalahari Desert. This homogeneity in appearance is typical, and virtually diagnostic, of almost all species, and a great evolutionary mystery. Darwin emphasized individual variation, which is unquestionably present in any herd such as this, but is extraordinarily difficult to discern, even after long-term familiarity with the herd. Each individual needs to be uniquely and prominently tagged to follow its life history and interactions with the other (tagged) members of the population.
Top: wild teosinte; middle: maize-teosinte hybrid; bottom: maize