Bird of Paradise

Male birds of paradise are not monogamous. They use their colorful, fancy plumage to attract successive females.

An excerpt from the article 23 facts about Bird of Paradise
Most males prepare an arena for mating dance  on the cleared of sticks ground or in the treetops. Some strip leaves from branches to make their mating dance clearly visible.A common part of such a dance is "standing on their heads," with their beak tilted as low as possible and their tail raised high and spread out.  They also spread their wings, puff out their breasts and perform spectacular turns. They make various sounds: loud chirping, whistling, buzzing.