This is about one of those laboratory experiments that just beg for word play in the article title. I resist. Perhaps it helps to be months removed from the publication date of the latest results; the bookmark would have been long since forgotten, except that I boldly left it at the top level of my bookmarks, where it reminded me daily of how much further behind I was falling.
Shigeru Watanabe has shown that pigeons can be taught not only to tell Monet from Picasso (PDF), but also to make seemingly more elusive distinctions, such as “good” art from “bad”. As reported in Science Daily: