I think it'd be pretty cool to add these to the game. Make them hard to harvest by not adding need zones for them, but make the tracks fairly common and offer an increase in creature spawns during Halloween events.
Just to keep things interesting, add things like strange howls or tree knocks and a moderate chance of a hostile encounter.
Or, don't add the actual creature, but add the tracks as an aesthetic thing on Layton Lakes, Silver Ridge Peaks, Mississippi Acres, Emerald Coast, Medved, and Yukon Valley.
There could also be a plaster option to keep tracks in our lodges. I know that sounds like a lot of unnecessary additions, but it'd undoubtedly be really cool.
Also, it should be an automatic maximum estimate diamond or a Great One 🙂