In an ancient Peruvian folktale, a hummingbird fetches water to put out a forest fire, one drop at a time. The other animals look on and laugh at her. Then, the little bird replies, “I’m doing what I can.” The tale inspired UN-Water, which coordinates the world body’s work on water and sanitation, to launch the ‘Be the change’ campaign for World Water Day on 22 March,  that urges everyone to do what they can to change the way they use and manage water.