Thank you Miss Lydia for the information. I keep my ducks' kennel aired out. Every morning when I let them out I pull out their water tub (which is on boards to keep it from sitting in mud) and give them their feed and they like to eat a few peas out of my hand. Then I fill their mortar tub pool with fresh water and they take their baths. I throw in a fresh clump of straw from my bale on top of the other straw and once a week I rake out all the straw, let the dirt air dry for the day while they are out then put in fresh straw. I hope thats good, it's my little routine and it seems to work. They also get fresh water in their little tub before they go in their kennel for the night and I duump out the water from their mortar tub each evening and leave it empty for the next morning.