Some male bowerbirds construct complex courtship sites that include bowers, which range from structures built around saplings to freestanding walls. In search of the origin of bower-building behavior, Borgia examined mating in several species of bowerbirds, and he reconstructed their family tree with DNA fingerprinting. His work reveals that bowers attract females, because such a structure protects them from forced copulations. In other words, males build bowers because of female choice.
Male bowerbirds build bowers, where they court and mate with females.
Here Macgregor's bowerbids dodge around the maypole during courtship. A male calls, a female moves around the pole and the male makes a countermove to keep the pole between them. If a female wants to mate, she stops moving, allowing a male to approach her.