One man found an eagle egg, and put his chicken. Bashny.Net

Eaglet grew up with chickens and became like them: he cackled as they dug into the ground in search of worms, flapped their wings and tried to fly.
 
Years passed. I have already raised the eagle in the sky saw the proud bird.

With extraordinary grace she overcame wind, only occasionally waving large wings.

Enchanted, the eagle said:

- Who is it?
- This is an eagle, the king of all birds - a neighbor told him. - He belongs to the sky. And we, chickens, belongs to the earth.

So the eagle lived and died like a chicken like chicken, because he believed in his chicken origin.