Once, a crow was flying thirstily by the marshes of Chorrillos (a Peruvian city) when it saw a water pot a long way. Rapidly, it went down into the water at the bottom. Eventually, it found a problem; it couldn’t reach at first to drink the water inside the pot due to less water. However, it tried with its beak once again when it had also failed. It stared at the pot worriedly and went down into the ground and it was trying to think motionlessly what to do when he got the hang of a clever plan .So, it was starting to drop small stones one by one as long as the water rose to the top. Finally, it succeeded and we could see an ingenious crow dancing proudly and happily. So friends the moral is: ‘Necessity is the mother of invention.’