The King Bird-of-paradise, Cicinnurus regius is a small, approximately 16 cm long, passerine bird of the Paradisaeidae (Bird-of-paradise) family. The male is a crimson and white with bright blue feet and green-tipped fan-like plumes on its shoulder. The two elongated tail wires are decorated with emerald green disk feathers on its tip. The unadorned female is a brown bird with barring below.

The King Bird-of-paradise is distributed throughout lowland forests of New Guinea and nearby islands. This so-called "living gem" is the smallest and most vividly colored among birds of paradise. The diet consists mainly of fruits and arthropods.

An extraordinary display is performed by the male with a series of tail swinging, fluffing of its abdomen white feathers that makes the bird look like a cottonball, and acrobatic pendulum displays.

Widespread and a common species throughout its large habitat range, the King Bird-of-paradise is evaluated as Least Concern on the IUCN Red List of Threatened Species. It is listed on Appendix II of CITES.

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