Lowering it just a few inches should still allow them access under the house.
I "muck" out my run in the fall. I only do it in the fall and I have many birds. It goes to the compost pile for use 2 years out. That means I have basically 3 piles. One for use now, one that has sat one year and one fresh. I use it as a top dressing around my flowers and in my veggie gardens.
Even with my many birds I get no odor from my run even standing right next to it.
I "muck" out my run in the fall. I only do it in the fall and I have many birds. It goes to the compost pile for use 2 years out. That means I have basically 3 piles. One for use now, one that has sat one year and one fresh. I use it as a top dressing around my flowers and in my veggie gardens.
Even with my many birds I get no odor from my run even standing right next to it.