The eagle has the longest lifespan of its species but must make a difficult decision as it ages. When its talons can no longer grab prey and its beak becomes bent in its 40s, its heavy, thick feathers also make flying difficult. The eagle then must either die or go through a painful 150-day process of renewal. It flies to a mountain top, knocks its beak against a rock to remove it, and waits for a new beak to grow before removing its talons. Once new talons grow back, it plucks out its old feathers. After five months, the eagle emerges renewed and lives for another 30 years.