I do burn most fleshing waste in the firepit also. I hope that is it

I have not but that makes me worry about that hemorrhagic disease. I’ve seen many animals lick patio stones and cinder blocks when they’re craving iron from loss of red blood cells. Not trying to panic you but that’s the first thing that came to mind

The rabbit looked very healthy. Maybe pregnant. Hopefully it's just wanting extra nutrients. Will watch for it acting sickly

Back when I lived in the Rust Belt, I'd see groundhogs on the shoulder of the road in the spring with their nose in the dirt. My guess they were licking remnants of road salt.

I have seen snowshoes licking dirt on the roads several times .

No worries. My semi domesticated rabbits like my ashes from my woodstove. Like chooks, and even the wild turkeys, who dust bathe in the ashes, mine have done the same thing. Ash is used as nutrient for plants and trees too, so I would say they like it for that. My rabbits are healthy and survive well roaming free on the estate. I feed them pellets and treats and can even pet them. But they’re still wild enough . I take care of any predators….

Sometimes I see song birds dusting in the ash too.