Scanning electron microscope (SEM) view of the head of a glasswing butterfly (Greta oto). The head bears large compound eyes (top), sensory palps used for tasting food, and a coiled proboscis, which is uncoiled into a sucking tube for feeding. The glasswing butterfly is named as its wings are not covered in colourful scales as is the case with most butterflies, instead having large transparent areas more like the wings of other insects.