Light trickery makes bird feathers blue but not red

Understanding the different ways in which birds get their vivid hues could help us make coloured displays for devices such as e-readers

Blue Cardinals: Are They Real or a Myth?

What species does the bird belong to, having blue feathers and a long, slender beak? - Quora

Random facts that blow your mind - The Something Awful Forums

Issue 2999, Magazine cover date: 13 December 2014

Why Are Some Feathers Blue?, Science

10 Incredible Macaw Facts - A-Z Animals

How Blue Animals Color Themselves With Nanostructures

Blue birds Memos from the Field

Bird-watching 101: How to Identify Birds - Birds and Blooms