Why are Birds most colorful animals on the planet?

There are thousands of species of birds here on Earth, and with those numbers come great biodiversity. Birds are among the most colourful animals on the planet due to the variety of pigments produced in their bodies and consumed in their diets.

Reactions a video series produced by the American Chemical Society and PBS Digital Studios releases a video which explores the wide range of chemical and physical tricks used to make birds stand out, disappear or even fluoresce bright-red under UV light.