World Water Day, celebrated on March 22, is an ideal moment to contemplate the importance of water to migratory birds. Migratory birds rely on water and its associated habitats - lakes, rivers, streams, ponds, all inland and coastal wetlands - for migration, wintering, and breeding. Unfortunately, increasing human demand for water as well as pollution and climate change threaten these precious aquatic ecosystems and the migratory birds that depend on them.