OP.....trying to decipher what you intended to say was a puzzle, but I think I have it right. Something moved rocks along your fence to get out. Or at least moved them. Perhaps while digging through them to get at what was living under them?
That might well be a weasel, or skunk or a lot of things. But the important takeaway is if you have rodents living in a pile of rocks, that alone may be what attracts a weasel to your property. Literature from most Fish and Game agencies will tell you that something like 95% plus of what a weasel eats is furry rodents. In that, they are one of nature's most potent weapons against them. So they are always on the hunt for large concentrations of rodents. But they are also opportunistic and can transition to killing your birds as easy as killing rodents. Makes no difference to them. Killing stuff is what they are programmed to do.
With rats and mice, our chickens and any spilt chicken feed attracts the rodents, which then attracts the predators like weasels and skunks (I've heard that skunks are better mousers than cats are).
So the takeaway is to keep a sharp eye out for these rodents. Chipmunks in the rocks, and rats and mice in the chicken house. If you see em, get rid of em. It's these rodents that will attract the notice of a weasel and you don't want that.