A Pellet
One day, quite by accident, I coughed up a pellet on Kay's window sill. The sight (and sound) of me hacking it up frightened her which then startled me and I flew away with the feather I had for her. She was horrified and grossed out when she realized what it was. Bones, teeth, feathers, and fur. It looked like a left her a mutant alien rodent. You see, I take what my body needs to nourish itself and be strong and throw the rest up. Imagine what would be in your pellet if you threw up everything you didn't need anymore.