The male bowerbird has a colorful way to sededuce females. To attract them, the male builds peculiar structures, decorated with colorful plastic ornaments. They collect all kinds of bright colored small objects, and place them visibly outside their love nest.
Most bowerbirds collect objects in either one or two colors. When they collect more than one color, they also carefully separate them.
The female birds are attracted by these bright colors, but before they pick a partner they commonly check out multiple bowers. Once the intercourse took place, the female bird will leave and raise the chicks on her own.
As you can see in the picture above, when a bowerbird lives close to a human environment it has the possibility to interact with a lot of colorful materials that can't be found in nature. The more colorful the nest, the more attractive the male will be for the females.
So, human wastes are increasing birds chances of mating, a creative way of recycling!