At the raptor centre, I watched the falconry display. I was in awe of the shocking, wicked and vicious magnificence of the fine bird of prey. It is an apathetic cruel creature that oozes a wicked beauty of nature's adaptations. It has no appreciation for the fine being it is and does not understand people's wonder for its untamed beauty. It just sees food. Its loyalty in coming back is food and it will eat until it is fed up.
Fed up is used by people to describe boredom. It comes from falconers in Medieval times. When the bird was gorged, it was well and truly fed up and would respond to no more commands and become disinterested in eating rewards.