Morpho didius, the giant blue morpho, is a Neotropicalbutterfly belonging to the subfamily Morphinae of family Nymphalidae.
Morpho, didius has a wingspan reaching 5.9 inches, making it one of the largest of Morpho species. The dorsal side of the wings are iridescent and metallic blue, and the forewings are quite elongated. This species can be found from Mexico southward, and throughout South America.