Suppose you are a fairly nice, but fairly common male.
Suppose you want to mate with a female deperately.
What to do to get a nice female interested in you?
The bowerbird is such a bird. Nothing special. And they have found a solution for their problem. They build.
They build a bower, a courtship site. A tunnel shape, or a hut. And they take a year, sometime two years to build it. Just to woo their female. To seduce them into his little love nest. The female see the bird do its dance in the hut and the illusion of the hut makes the bird look larger and more impressive than he really is.
Scientists recently discovered that around the nest of the Bowerbird grow remarkably much fruit bearing plants. And the fruit these plants carry the Bowerbird uses to decorate its nest. When the fruit wither and dies it is removed from the nest and at some distance put down. There it has a chance to grow into a new plant. Bowerbirds use their nest for about ten years on the same spot and thus around the nest the bird has build a real little garden with plants that bear fruit.
The basic design is similar for all bowers : an intricate cone-shaped stack of thin bare branches form a hut with a front entrance, and various collections of forest material are disposed inside or in front of the hut to produce a stunning display site, built by the male bird with the aim of attracting female birds. All bowers are however different : the shape of the hut, the choice of display items. colors and shapes, their arrangement. Typically the Bowrebirds would pick fruits, berries, flowers, mushrooms, beetle elitra, etc… , but when close to villages colored plastic or metal items are also chosen as long as the bird finds enough of them to make it a collection.
Bowerbirds have also been observed creating optical illusions in their bowers to appeal to mates. They arrange objects in the bower’s court area from smallest to largest, creating a forced perspective which holds the attention of the female for longer. Males with objects arranged in a way that have a strong optical illusion are likely to have higher mating success.