
Update: sinkhole is bigger than I thought, but there is no water line
Figured out how to upload pictures (thanks u/JohnHartshorn): https://imgur.com/a/9xwiHea
This sink hole popped up over the last week and at first I wasn't too considered because it seemed small, but after poking around a bit it seems like it's actually quite deep (at least 3') and narrow (<5"). The line going across that people thought might be a water line in the last post turned out to just be an old root. The whole area is clear of any utilities.
I've heard it might be rodents; if that's the case, what's the best option? Just refill with soil?