This article reminds me of classical history. For Greeks beauty was harmony which they translated to mathematical terms. In the article they only equate beauty and face symmetry. I wonder if chickens or other animals would be attracted to canons of body proportions. Or even to non-natural objects based on the golden ratio for instance. Time to test if the renaissance Vitruvian man was all right!
One of the most terrifying things was those symmetrialised (is this a word?) faces of celebrities few years ago flooding the web. Completely inhuman look.