The male is polygamous and performs a breathtaking courtship display. But unlike all other Paradisaea species, he performs solitary with attending female nearby. In display, the male hangs from a branch upside down. The black oval with red margin at the center of his chest is rhythmically enlarged and contracted. His violet blue plumes spread out in a fan, swaying its body back and forth while the central tail feathers form two impressive arches down to either side. Throughout his performance he vocalizes softly in a low but harsh vibrating voice.
Regarded by ornithologists as the loveliest of all birds, the Blue Bird of Paradise was discovered by Carl Hunstein in 1884. The scientific name commemorates the ill-fated Crown Prince Rudolf of Austria.
Due to ongoing habitat loss, limited range, small population size and hunting in some areas for its highly prized plumes, the rare Blue Bird of Paradise is classified as Vulnerable on the IUCN Red List of Threatened Species. It is listed on Appendix II of CITES.