4. Bluebird of Paradise
A lot of people, including bird specialists, believe that the Blue Bird-of-Paradise is the most beautiful bird in the world, and it’s easy to understand why. Males are distinguished by their brilliant blue tails, ivorybills, and white eye-rings, while females are black on the head, breast, and rear.
The reddish-brown flank feathers and two long, flowing tail feathers round off this stunning costume.