I don't know about my ferrets, but I don't like them. Tried them for my cat - they're like marbles when they get all over the floor. Actually, it was probably my ferrets, not my cat, who threw them out of the litter box - just to watch me try to vacuum them up! I'll stick with wood pellets, thank you. I get them for free from my local fireplace shop. They give me the "damaged" bags - a little hole or something. Nancy and critters [Posted in FML issue 3071]