We will have a covered run attached to our coop - what does everyone put on the ground? It is currently mostly dirt where the run will be, some grass near the front. It is under some of our enormous pine trees, so there are tons of pine needles I could use. How often do I need to rake it out? I don't want to use shavings out there..... Do I really need something on the ground if it's dirt/grass? Would it work to just rake it out daily (it is along a hillside and I can just push all the droppings down the hill....super convenient!).