Hawk is the world's longest bird, it lives up 70 years of age. To live such a long life, it is gradually aging in the age of 40 must make a difficult but important decision. Eagles first hit the rock with its beak until it completely off, and then quietly wait for a new beak to grow back. Eagle will use a new beak to grow claws on the aging of nails pulled out a one, drops of blood spilled. When the new nail grow back, the Eagles will use a new nail to pull the body feathers 1 1. 5 months later, the new feathers grow back, and Eagle to start flying again over 30 years of his life again.
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