Flying at fat weight

"Flying at fat weight" - when even a trained bird of prey is fat, he doesn't feel the need to return to his trainer. The connection he has with the falconer is like a spider's thread based on constant food motivation - the falconer feeds him, and helps him to find good hunting occasiones, which, if succesfull, rewards well. But the birds of prey cannot be domesticated, and are still wild creatures, some species can become more close in their relationship with their human companion, while others - especially goshawks and sparrowhawks - have an especially wild nature. If lost, in only one day they may forget all the training, and are creatures of wilderness again. To me, this is what makes falconry so fascinating