Our chicken coop is next to our large walnut tree. We want to extend the coop to include the tree. The plan is to cut off all the greenery inside the coop, leaving the lower branches for roosts, and covering the wire on the top of the coop with shade cloth to stop the walnuts and leaves falling into the coop as we understand these are toxic. Is it safe for our chooks to scratch in the earth at the base of the tree? Anyone with any ideas?