How extreme beauty might defy survival of the fittest

Is beauty always a proxy for genetic health and fitness? Charles Darwin didn't think so.

RICHARD PRUM: One of the most aesthetically extreme birds is the Great Argus, a kind of pheasant found in Southeast Asia. After Darwin wrote The Origin of Species he was challenged by the Duke of Argyll in an anti-evolutionary tract to examine the feathers of the Great Argus Pheasant, which included these beautiful golden spheres like a three-dimensional optical illusion, arrayed on the wing feathers. Indeed, Darwin spent a long time trying to hypothesize how these beautiful spheres could evolve from intermediate states through the process of mate choice.

In the coming century the first person to ever see, the first scientist ever to see the display of the Argus Pheasant was William Beebe. He traveled to Borneo, where he spent months studying the bird in the wild and only getting occasional glimpses. First, he found a male territory, where the six-foot-long male pheasant displays in an area about the size of a quarter of a basketball court. He clears the soil and waits for a female.

Well, when Beebe built his first blind or hide right next to the display site, the male abandoned it. Later he tried building a tree house over another one, and the male abandoned it as well. In his third attempt, he had his assistants dig a foxhole in the ground right by the display site, and every morning he got into the hole and was covered up with brush, and he spent all day hiding inside of a foxhole in the forest in Borneo. After a week, finally, a female visited this male and he was able to see the amazing display of the Argus Pheasant.

In this case, what happens is the male opens his wings and arrays his wing feathers like a blown-out umbrella, creating a hemisphere that is suspended over the female. In this case, the golden balls on his wing feathers are suspended in the air, shaking, right over the female's head. It's an amazing and striking display. How could this have evolved? Well, Beebe, when he looked at them, noticed that the hen, the Argus Pheasant female, was basically stoic or unresponsive, and he wrote that "it's clear to me that any aesthetic impact of that display is wasted on that little hen." In other words, he couldn't imagine that she was having the kind of aesthetic experience that he was. Of course, he had been spending months in search of this bird, and a week sitting in a hole in the ground; he's having a religious experience! He imagined that the bird should be dramatically moved. But I think he got it fundamentally wrong.

In fact, behind every evolved ornament in nature, like the Argus Pheasant display, there's an equally elaborate and coevolved cognitive concept about what is beautiful. The better way to imagine the female's behavior is like a connoisseur or art collector at an art exhibition. How do they regard this new art? Well: critically, with some discernment. And this is exactly the attitude of the Great Argus female, because she, through her choices, is really responsible for the elaborate evolution of those ornaments. Now, is the display of the Great Argus an honest signal of male quality, or merely beauty happening? It's an interesting question that still isn't resolved. But I believe that there are so many dimensions to this ornament that it is unlikely that it could communicate quality. In this case, all of the different golden spheres, their array over the female, the many other elaborate details of display, each one of them could only evolve as an honest indicator of equality if they were independently associated with additional information about mate quality. Each cost would only evolve if it provided information. So I think it's extremely unlikely that aesthetically extreme displays like the Argus Pheasant evolved because of honest advertisement or adaptive Wallacian mate choice. I think they're another fantastic example of beauty happening.

  • The Great Argus Pheasant is a six-foot-long bird with elaborate ornamentation on its wings, including golden orbs that create a 3D optical illusion. It fans its feathers in a full hemisphere above the female hen as part of its mating display. Is all that beauty just a signal of fit and healthy genes?
  • Perhaps not, says Yale ornithologist Richard Prum. The 'beauty happens' hypothesis, or aesthetic evolution by mate choice, was an idea first proposed by Charles Darwin—but it is still not accepted as part of standard evolutionary theory.
  • Prum reasons that the kind of extreme, impractical beauty seen in animals like the Great Argus Pheasant is a result of aesthetic mate choice rather than survival of the fittest. Perhaps some species evolved such beauty because it pleases the animals themselves.

LinkedIn meets Tinder in this mindful networking app

Swipe right to make the connections that could change your career.

Getty Images
Sponsored
Swipe right. Match. Meet over coffee or set up a call.

No, we aren't talking about Tinder. Introducing Shapr, a free app that helps people with synergistic professional goals and skill sets easily meet and collaborate.

Keep reading Show less

What’s behind our appetite for self-destruction?

Is it "perverseness," the "death drive," or something else?

Photo by Brad Neathery on Unsplash
Mind & Brain

Each new year, people vow to put an end to self-destructive habits like smoking, overeating or overspending.

Keep reading Show less

A world map of Virgin Mary apparitions

She met mere mortals with and without the Vatican's approval.

Strange Maps
  • For centuries, the Virgin Mary has appeared to the faithful, requesting devotion and promising comfort.
  • These maps show the geography of Marian apparitions – the handful approved by the Vatican, and many others.
  • Historically, Europe is where most apparitions have been reported, but the U.S. is pretty fertile ground too.
Keep reading Show less

Douglas Rushkoff – It’s not the technology’s fault

It's up to us humans to re-humanize our world. An economy that prioritizes growth and profits over humanity has led to digital platforms that "strip the topsoil" of human behavior, whole industries, and the planet, giving less and less back. And only we can save us.

Think Again Podcasts
  • It's an all-hands-on-deck moment in the arc of civilization.
  • Everyone has a choice: Do you want to try to earn enough money to insulate yourself from the world you're creating— or do you want to make the world a place you don't have to insulate yourself from?
Keep reading Show less