Varying wing spots on butterflies

Researchers report that white spots on the wings of a Costa Rican rain forest skipper butterfly (Carystoides escalantei) can appear either dull or bright, depending on the angle at which the spots are observed; at certain angles, the scales in the bright spots reflect sunlight with minimal scattering due to their microstructure and orientation, findings that could influence the design of reflective materials.

Article #17-01017: “Varying and unchanging whiteness on the wings of dusk-active and shade-inhabiting Carystoides escalantei butterflies,” by Dengteng Ge et al.