Morpho didius (male)
 
Morpho didius, the giant blue morpho, is a Neotropical butterfly belonging to the subfamily Morphinae of family Nymphalidae. It is considered, by some authors, to be a subspecies of Morpho menelaus.
Morpho didius has a wingspan reaching 150 millimetres (5.9 in), 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 in Peru.
This genus contain about 70 species and it is a big group of NYMPHALIDAE. MORPHO butterflies are from South America (NEOTROPIC). This butterflies have  flouresce blue on there wings.  This optical phenominon based on  refraction and  interference.  
The morpho butterflies comprise many species of Neotropical butterfly under the genus Morpho. This genus includes over 29 accepted species and 147 accepted subspecies, found mostly in South America, Mexico, and Central America. Morpho wingspans range from 7.5 cm (3.0 in) for M. rhodopteron to 20 cm (7.9 in) for M. hecuba, the imposing sunset morpho. The name morpho, meaning "changed" or "modified", is also an epithet. Morpho didius, the giant blue morpho, is a Neotropical butterfly belonging to the subfamily Morphinae of family Nymphalidae. It is considered, by some authors, to be a subspecies of Morpho menelaus. Morpho didius has a wingspan reaching 150 millimetres (5.9 in), 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 in Peru.