You know man....like aliens... Just kidding I am not sure why I added the; "other non-humans" bit, I may just be tired. Necropsy is actually the exact same thing as an autopsy. However, the prefix "auto" means self, therefore, when performed on "one of our own" (i.e. human) it is called an autopsy. But when performed on a non-human, the term necropsy is used. Same thing, different application. Hope that helps.