I use the pelleted pine bedding for my horses and, knowing that ducks are quite messy, I decided to try it for my ducklings as well. They moved to their outside home at 3 1/2 weeks (4 ducklings), and it has now been 4 weeks since they've been out there, and I have not had to change out the pellets yet. I'm thrilled! Their space in the coop is about 4' x 6', and they are inside from probably 8 p.m. to 6 a.m. The rest of the time, they are out in the run. I made the layer of pellets about 1" thick. I have been doing the sniff test - on my knees, and nose right down to the pellets - every day, and have not smelled anything nasty, ammonia, or anything. The pellets smell almost as fresh as they did when I put them in! I rake them around every few days, and will probably change them out this weekend because although I am not smelling anything, it just feels like it's time! Anyway, I wondered if anyone else uses the pelleted bedding and experienced the same results?