Put out a game camera. You'll be surprised what you see in your yard at night. Fox, skunks, coons, coyote, deer, squirrels, cats, dogs, kids. There's a party in my backyard nearly every night with one thing our another and I live in the burbs. Had 7 deer bedded up around my patio one night. Looked like they were here for a BBQ. Finally figured why a shrub kept dying in a particular spot even though I kept replacing them. Big ole buck was using the spot as a scrape and was ripping and peeing on them. The squirrel must hear the camera because he stares into the lens all the time.