The blue color of morpho butterflies isn’t pigment; it’s physics.
Their wings reflect light due to microscopic scales that act like tiny mirrors, reflecting light to produce the brilliant blue color. This phenomenon, called structural color, makes their wings appear as shimmering light blue mirrors.
Under UV light, the iridescent effect is even more dramatic, allowing blue morphos to signal to each other for mating while staying unnoticed by predators such as birds.
Morphos have two fore wings and two hind wings. When their wings are folded, they blend into the forest floor thanks to dull brown undersides marked with eyespots that provide camouflage.
But when they fly, their bright blue wings flash in a bouncy flight pattern, confusing predators by appearing and disappearing with each beat.
