Monday, July 27, 2009

Satin Bowerbird.



There is a lot to say about bowerbirds. These Australian birds have perhaps the most complicated courtship ritual of any bird species. If new to you, it might also call into question your conception of art and creativity in humans.

Bowerbirds (male = picture 1, female = picture 2) build bowers (picture 3). Well, just the males do. Bowers are structures made from sticks, flower stems, rope... whatever is around. These structures form either dens or u-shape structures, and are not actually nests. Their only purpose is for mating displays. While most birds use feathers, calls and dances to attract females, this one adds an extra layer; design. Each species of bowerbird forms different shapes, but each individual designs their bower differently. They find objects from their surroundings (or steal them from other bowers) to decorate their bower. This can be by texture, color, shapes, you name it. And are arranged carefully to the point that it looks intentional. An individual's design might attract an individual type of female.

What's even more peculiar is that the females visit the bowers before seeing the males. They choose which they prefer, then later comes to the site when it is further to completion -- some decisions about the mate have been made entirely on the bower. Then the female returns when the male does calls, displays, etc. It is thought that this bird is especially unique because its physical attributes may be negated by its creations. So if it has bad feathers, it might be able to make up for that by having an exceptional display, or a refined call. Other birds can't do that -- they've just got to flaunt what they've got.

But why wouldn't the female use color to assess its mate? That seems to be the case in other bird species, and it can be telling of a birds health. In this case, the creativity in a bower might suggest its ability to acquire goods and hold territory better than other males; a valuable ability for sure.

The bower's functionality itself is still not entirely clear. The satin bowerbird's structure is somewhat understandable, in that it is essentially a contraption... during copulation, a female walking through the bower might not be able to fly away, since its wings cannot spread. This isn't the case for all bowerbirds though. And before you think this forced copulation seems aggressive, keep in mind that the female has chosen an individual based on the bower long before visiting the site and sometimes visits multiple times to hear its call and watch his display as well. So it seems the female has to let copulation occur -- maybe the structure is a remnant of a behavior its ancestor had when perhaps forced copulation was the norm? Who knows.

So why does this call into question our sense of art and creativity?
We often think most animals work mechanically, with the exception of us. They just "do" things and don't think about it. There's no control over its actions.

This might still be the case with this bird -- it might be a natural preference and each bird might have a gene that makes it get one color over another, or one shape over another. But the point is each is different and each artful display holds no functional value other than impressing the other sex (the fruits, flowers, seeds, shells, etc are never used for feeding, protection or health). Though we don't label our art quite so directly, when we do similar things, we say it's not to attract others (because that's what's favorable to others) and we say it comes from creativity that involves individuals thought. And we convince ourselves of this.

It's not to say we don't have individual preferences that require thought or creativity, but how are we any different than this species in that regard? Either our creativity is innate for validation or attraction or these birds have significantly more thought than we would like to think and don't give them credit. When we study other animals, it seems obvious that it's the first option and it seems like we just say that can't be the case for us because it makes us feel better and... uh-oh.... validate our creativity.

Regardless of your thoughts, it's an incredible display and I personally think it applies to people very well.

Here's a video feature the wonderful David Attenborough:


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