Never noticed this before.
Trapping some ground where a guy had cattle but has moved them out. Of course they've left a lot of "residue" around and something has been tearing those piles apart - even flipping some over. I'm guessing whatever is doing this is looking for earthworms or other such things. (It's been warm here and earthworms still haven't taken a huge dive down deep into the soil)

Any ideas on what might be doing this?

Sure do, skunks and turkey both find food rewards there also crows at times.

Oh great!! Ya' could'a said coyotes!! LOL!
How about grinners - I'm covered up with 'em?

Thanks my man!

Raccoons and coyotes do that too. Coyotes eat earthworms

Most of the time in my neck of the woods it’s skunks

Probably the local dopers looking for those "magic" mushrooms....

skunks here do that.

skunks fox coons yotes, possums, and many birds. Back when we had enough fox here to get after them it was one of my favorite sets. easy fast and had everything right there to make them.

I saw two coyotes out in open grass pasture in wy when I was trapping out there, I stalked them shot one, then went and looked at what they were doing, they were flipping dry pies over and eating small grubs under the cow pies

My guess is turkeys looking for worms bugs or whatever is under there.

Badgers do that here

We don't have cows anywhere close to me but around here, bears turn rocks over everywhere looking for goodies.

Coons and skunks do that.

Skunks are normally the ones doing it, but possums, coon, and coyote will too. There are grubs inside/under the piles.