Glasswing Butterfly

The most commonly recognized glasswing butterfly is Greta oto, a member of the brush-footed butterfly family (Nymphalidae) native to Central and South America. Its range extends from Mexico through Central America into Colombia and Venezuela.

The transparent areas of the wings lack the colorful microscopic scales that cover most butterfly wings, leaving only bare membrane visible. Additionally, the membrane surface has specialized nanostructures that reduce light reflection, making the wings nearly invisible against dappled forest light.

Adult glasswings feed on nectar from flowers, particularly those of the aster family (Asteraceae), and they actively seek out plants containing pyrrolizidine alkaloids. These compounds play a role in male pheromone production and courtship behavior, similar to the chemical gathering behavior seen in some ithomiine butterflies.

Glasswing butterflies inhabit tropical rainforest understories and clearings from Mexico through Central America and into northern South America. They are commonly observed in countries such as Costa Rica and Panama, where their transparent wings provide camouflage against the bright, dappled sunlight of the forest edge.