Hi Egraine, I think it is a big, gray, stray cat. Saw it on our deck today but our great big Maine Coon cat girl scared it off by her loud hissing. She is in an enclosed screen porch area so can't go out herself. She is strictly an indoor cat; but she sure made enough noise to scare this stray away. This also let me know who the culprit likely is. Thanks..about the moth balls. However, too low for me to crawl under the house. It's been since my mom's day that I have used them and I do remember that smell. Growing up we hung them in the closet to protect our wool things from moths.