In a dense forest, there was lake. All the animals used to drink water from the lake. The water of this lake was so sweet that many fish lived there for long time. In this lake there lived a crab. The crab’s best friend was a swan. That swan was in the same lake. They were happy in the company of each other. Their happiness lasted until one day a snake made its home near the lake.

Every day the swan laid an egg. The snake would come and eat it up. “I have to find a way to save my eggs," thought the swan.

One day, he went to the crab and said, “Please help me, dear friend. My eggs are under threat. That...