The eagle faces a difficult choice in its 40s, as its talons can no longer grab prey and its beak and wings have deteriorated. It can either die or undergo a painful 150-day process of regeneration, where it knocks out its beak against rocks, allows a new one to grow, then removes its talons and old feathers. After five months of change, the eagle emerges reborn and lives another 30 years, demonstrating that change is sometimes necessary for survival and to take advantage of new opportunities.