Here's a breakdown of the name:
* Caligo: This is the genus name. It comes from the Latin word "caligo," which means "darkness" or "shadow." This refers to the dark, almost owl-like markings on the wings of these butterflies.
* Idomeneus: This is the specific epithet. It is named after Idomeneus, a king in Greek mythology who was known for his courage and wisdom.
So, "Caligo idomeneus" literally means "shadow of Idomeneus." This name is quite fitting, as the Giant Owl Butterfly has large, dark wing patterns that resemble owl eyes, and it is a majestic and impressive butterfly.