Birds-of-paradise are sending secret color signals invisible to human eyes, scientists say - CNN

Birds-of-paradise are even colorful in the dark, with feathers and body parts that glow a brilliant yellow-green under ultraviolet (UV) light, a new study found.Sign up for CNNs Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Many types of birds such as hummingbirds, peacocks and…