A Morpho butterfly looks like this. Emanuela Carratoni/iStock/Thinkstock
Butterfly wing color made of pigmented liquid - ScienceDirect
How Animals Hacked The Rainbow And Got Stumped On Blue : Shots - Health News : NPR
Butterfly wings hold clues to evolutionary adaptation
Drab butterfly reveals its hidden colours – Physics World
Scientific Image - Blue Morpho Butterfly Wing
Peeking into a chrysalis, videos reveal growth of butterfly wing scales, MIT News
Butterflies and Beyond Smithsonian National Museum of Natural History
Structural color in Junonia butterflies evolves by tuning scale lamina thickness
STEMVisions Blog, Page 2
Cost-Effective picture of a butterfly
Morpho Butterfly Insect Facts A-Z Animals, 47% OFF
Scientists Edit Butterfly Wing Spots and Stripes