Owl pellets contain fur, bones and mucous and other gross stuff. Most people think that pellets are owl poop but they are wrong. Owl pellets are an owls dinner, they digest as much of it up as they can but the rest is regurgitate remnants of the animal. For science during the next month our home school group is going to dissect owl pellets. We are ordering them from online. Most owls regurgitate 1-3 pellets per day. When an owl first throws one up they are smelly and covered in mucous. I have never found one before. People say that you have to look around dead trees with holes or nests in them. Most pellets are between 1-5 inches long. It depends on the meal.