I need to borrow a camera trap, aka trail cam, to find out who is rubbing along the bottom of the fence. I left the grass untrimmed to provide additional evidence of something moving along the fence, and squeezing beneath it. And see? It is pressed down. Candidates I can imagine are striped skunk, and Norway rat, although the rub line seems too high for rat, and I haven't seen a skunk in quite a while. There are no other rat signs (evidence of burrowing in the garden), no grub-digging holes in the lawn that would suggest skunk, and little to attract either creature, or anyone else into the yard. Other mammals about are eastern grey squirrel, raccoon, and domestic cat, but those three tend to take the high road, the fence top. So I watch the rub line become increasingly distinct as the question mark above my head grows.