So what in the world were tiny respiratory channels doing in a wing membrane of a morpho dragonfly ... of black pigment–filled nanolayers. This setup can enhance reflections of blue light ...

What you might see is the common whitetail, an abundant dragonfly with a dusky blue-white abdomen and black bands on its otherwise clear wings; the common green darner, a 3-inch-long dragon with ...

These were in the form of a tracheal system inside the membrane which, combined with other characteristics of this dragonfly, may account for the notable bright blue design of male wings.