If you go to the Wikipedia entry on “peafowl” and click on the “talk” tab, you can read a comment made Sep. 25, 2012, critiquing the section on peacock tails. (Peacocks’ iridescent many-eyed tails are something of a biological puzzle because they can be so heavy the birds can barely walk — so the question has always been what benefit they confer that outweighs the obvious disadvantage.)