有资料记载,老鹰是世界上寿命最长的鸟类,年龄可达70岁。当它活到40岁时,爪子就开始老化,无法有效地抓住猎物。它的喙变得又长又弯,几乎碰到胸膛,翅膀变得十分沉重,飞翔十分吃力。此时,老鹰有两种选择:要么等死,要么经过一个十分痛苦的改造更新过程。这个过程长达150天,它必须很难地飞到山顶,在悬崖上筑巢,停留在那里,不得飞翔。老鹰先用它的喙击打岩石,直到完全脱落。然后静静地等候新的 Data records, the eagle is the world’s longest life of birds, up to 70 years of age. When it reaches 40 years of age, its paws begin to age and can not effectively hold their prey. Its beak became long and curved, almost touching the chest, its wings becoming heavy and flying very strenuous. At this point, the eagle has two options: either die, or after a very painful transformation process. The process, which took as long as 150 days, must fly hard to the top of a mountain, nest on a cliff, stay there and not fly. The eagle first hits the rock with its beak until it is completely detached. Then quietly waiting for the new one