fuzzy, I bagged all my leaves for the run, add as needed. I bagged the leaves when they were dry, or so I thought. There is a bit of dampness in the center of the bags. Well anyway, as you could smell, there was no yucky smell in the run at all, and those leaves have been breaking down pretty fast. I am thinking I needed to bag up more. I have 3 bags of leaves left. Don't think they'll last out the winter. I also have some in the roosting area where I can walk in, and they don't seem to be too bad in there either with the pine shavings mixed in. Just a thought.