One commenter on Clarification sought on the six-inch-cat-hole rule says of toilet paper, "One issue is that (even if it does biodegrade), animals may dig it up and scatter it around..."
I've heard this in various forms, the two basic claims being that animals will find and dig up buried human excrement, or that they'll do this with toilet paper.
I know that dung beetles seek out scat, but digging up a human's cathole would be a major excavation project, and scattering what they find would be a huge waste of time and energy.
Undisturbed animal scat is a common sight in the woods where I live, and is often days or weeks old.
Have animals been observed doing this? What animal passes over scat from other animals to find human scat and dig it up? Does burying toilet paper with the waste statistically change the occurrence of this practice?
To make the claim more notable, NPS' website says:
Bury the brown stuff in a 4-6-inch hole dug in a sunny place at least 200 feet from water, washes, rock shelters, climbing routes, and bouldering problems. Wildlife will dig up soiled toilet tissue, so bring a bag and pack it out.