https://www.pbslearningmedia.org/resource/30254df7-0e43-463c-86b3-8d765ebf82d8/what-gives-the-morpho-butterfly-its-magnificent-blue/
What does it mean to be blue? The wings of a Morpho butterfly are some of the most brilliant structures in nature, and yet they contain no blue pigment -- they...
morpho butterflyblue deepgivesmagnificentlook