200
Owls are able to eat many kinds of small mammals, by swallowing them whole. But their stomachs can not digest fur, feathers, and bones. What is it called when the owls spit up these parts?
An owl pellet. The owls stomach digests all of the meat from the animal they just ate. Everything else is squeezed into the hard pellet that they spit up.
animals.howstuffworks.com