Not seen on the Delmarva peninsula in 27 years, the endangered Hessel’s Hairstreak butterfly reveals itself in a Delaware swamp. For the first time in 27 years, the rare Hessel's Hairstreak butterfly ...

This is the blue morpho butterfly, which has a cool alien-sounding name, but also has inspired a new biomimetic fabric that refracts light like the butterfly’s wings. It’s just one of the eco-friendly ...

It's the size of a 10-cent piece and matures under the guard of protective ants, but the purple copper butterfly needs more ...

In a forested region of Angola where a cliff separates the landscape, a new species of butterfly was discovered. Getty Images/iStockphoto In the forests of northwestern Angola, the canopy of trees ...

Up to 20 layers of transparent scales on butterfly wings scatter white light to produce brilliant blue structural color. Alison Sweeney, Duke University, and collaborators at the Smithsonian Tropical ...