 become too thick and heavy, and prevents it really from flying very far. So the eagle is now faced with a choice, either a slow, painful death, not being able to eat, or a long and painful period of change that can last over 100 days. So it flies to a nest on the top of a mountain, usually, find a place where at least there's rocks, and beats its beak against the rock for as long as it takes until the beak breaks off.