Once upon a time there was a crow lived in a jungle. The crow was black which you know is black as coal. He lived in a beautiful jungle where there was everything beautiful. Other animals were beautiful than the crow. The crow was unhappy. Because it was ugly and was envious of the Swan. Because her feathers were as white as the purest snow. The crow was very pleased to see the sparkling white color. Once he asked the Swan, "You look very beautiful. Will you tell me the secret of your whiteness?" "Why not!" Swan replied. "The secret of my whiteness lies in my dwelling in the water all the time."
The foolish crow got the idea that if he lived like the Swan, swimming and diving all day long and eating the weeds and plants that grow in the water, his feathers would turn white like the Swan’s.
So he left the jungle in the trees and flew down to live on the lakes. He was diving in the water and ate what swan took as food. He washed and washed all day long, almost drowning himself at it, his feathers remained as black as ever. All the foods taken by him was not digested. So he got thinner and thinner, and at last he died.
Moral: A change of habits will not alter nature.