What is a bird of prey's cloaca used for?

Well what happens is, say a hawk ate a rabbit they would eat it and then go down there oesophagus into the crop and anything the hawk cant digest stays in the crop but the things it can digest goes down the stomach and the gizzard and food goes up and down until fully digested then through the intestines and comes out the cloaca, and what comes out of the cloaca is called a mute (poo)

hope that answers your question