Maybe a trap or hunter card that could interact with rabbits similarly to how the lumberyard or mason works. This could also be expanded to trap/hunt something like deer, badgers or foxes, that could spawn from a 2x2 of trees or something.
A hermit. Maybe they get a benefit from being surrounded by fields, meadows or trees - not really sure what effect they give, but essentially the opposite to a housing settlement, where its an incentive to have more of a wild setup.
A witch. When surrounded by trees they'll have s chance to offer single month buffs - similar to the player spells but a lil weaker and with more random.
Magic toad stool. When near a meadow does something. If eaten by a rabbit can mutate the rabbit in someway maybe. If setup near a witch maybe she could consume it to give a more powerful spell.
Not very well thought through ideas, but might give some inspiration :P