the coolest moth

At first I thought a leaf was stuck to our house, but then I realized it was a huge moth - about 3 inches from wingtip to wingtip! I took a picture of it and then Simon took a picture of me taking a picture of it. Fun stuff.

I think it may be a Montana Sphingidae, but it might be some sort of Sphinx moth too. I can't tell because we never saw it with the wings fully opened. I may have to submit it to whatsthatbug.com to figure this one out!