Oldschool Runescape has a roaming creature called a herbiboar which you can track, and then harvest a random assortment of herbs from its back. Mabinogi has a very similar set of creatures that serve the same purpose. It would be cool to have similar creatures in haven such as a cave lizard with mushrooms on its back, or a dryad that can be plucked for healing roots or other medical supplies.
Mabinogi:



Oldschool Runescape Herbiboar:

Here is my idea for what a Haven cave creature may look like

When it dies/is harvested clean

Rather than killing these creatures for their skinned goods, I think it might be better if they were passive and would only have a chance to attack while being harvested, similar to pulling auroch hairs.