This is a gigantic moth at the Schmetterling Haus in Vienna. It's appropriately called an Atlas moth, and it's too bad there's no obvious scale to see how big it is. From wingtip to wingtip I'd put it at nearly a foot.
It's also a very lazy moth. It might as well have been a statue for all the movement I saw out of it during a half hour visit.
They're nocturnal. You probably don't move around all that much when you're asleep, either.
It looks like a diagram of muscle and sinew. It also looks tasty. If I were an insectivorous animal I'd definitely eat it.