This is the story of an eagle
The Eagle has the longest life-span of it's species
It can live up to 70 years
But to reach this age, the eagle must make a hard decision
In it's 40th year its long and flexible talons can no longer grab prey which serves as food
Its long and sharp beak becomes bent
It's old-aged and heavy wings, due to their thick feathers, stick to it's chest & make it difficult to fly
Then, the eagle is left with only two options: DIE or go through a painful process of CHANGE which lasts 150 days
The process requires that the eagle fly to a mountain top and sit on it's nest
There the eagle knocks it's beak against a rock until it plucks it out
Then the eagle will wait for a new beak to grow back and then it will pluck out it's talons
When it's new talons grow back, the eagle starts plucking it's old-aged feathers
And after 5 months, The eagle takes its famous flight of rebirth and lives for 30 more years
Why is change needed? Many times, in order to survive we have to start a change process. We sometimes need to get rid of old memories, habits and other past traditions. Only freed from past burdens, can we take advantage of the present.

Note: that several slightly different versions are circulating