A migratory butterfly, Greta oto is often spotted in Central South America on both the Atlantic and Pacific sides of the country, from 500 to 1,600 m. The glasswing has also been spotted in southern USA = Florida, Texas, Etc.
The glasswing is so named due to its gloriously transparent wings. A brown to reddish-brown border helps make Greta oto’s wings more visible. The upper part of the forewing also has a white stripe through the brown region. Glasswings lack the tiny scales on most of their wings so the wings are see-through.
Adults have scaly antennae and an elegantly thin, brown body powering the delicate, clear wings (the veins in their wings are visible). Males have an additional feature to their wings: on the hind wing is a small plume of fine hairs that stay tucked under the overlap of the forewing most of the time. These become helpful in courtship.
As an adult, this butterfly drinks the nectar of certain flowers like Lantana (Verbena, Asteraceae and Boraginaceae). The glasswing’s body absorbs chemicals from the nectar which make the glasswing taste unpleasant enough to discourage predators from eating them. The average length of a glasswing butterfly is 28 to 30 mm.