Caligo atreus, the yellow-edged giant owl, is a butterfly of the family Nymphalidae.

The larvae feed on Musa and Heliconia species and can be a pest for banana cultivation.

Adult males remaining inactive for most of the day until around 6 AM and 6 PM for an hour.

Chrysalis mimic dead leaves with shiny gold spots.

Adults are common in butterfly houses because of their relative ease to breed.