I found this moth on my back deck this afternoon. To give you some size perspective, the post it is attached to is a 4×4. I would guess that this thing’s wingspan is a full 4″ or very close to it.
Can you see in the 3rd picture how he has 2 sets of wings? I know these aren’t artsy fartsy pictures of the bug, but to be quite honest with you, I didn’t relish the prospect of getting all that close to it. I have never seen a moth anywhere near this big. I’m going to send his picture to the Missouri Department of Conservation to see what they have to say.