A long time ago, sun fell in love with a princess. The sun decided to deliver her a blood red ruby stone as a love token. The sun asked a crow to deliver a ruby which he had put into a silken bag for his beloved, who was a princess on earth.
The crow was milky white in those days. It was a sacred bird. While passing over a village, the crow felt hungry and decided to stop for a while. He hung the bag on a small branch of a tree and flew off in search of some food. Meanwhile a merchant noticed the bag and pocketed the ruby. Instead, he put some rubbish in the bag. When the crow took the bag to the princess, she saw the rubbish in the bag and became very angry. Later, when the sun came to know what had happened, he was so furious that under his burning glare all the feathers of the crow got burned and turned black.