Lake Nakuru National Park, Kenya: One of thousands of dead flamingos on the dry lake bed. The number of flamingoes living on the lake has declined dramatically, a number of factors have been blamed including the receding waters of the lake, and pollution. Kirsty Wigglesworth / AP

Lake Nakuru National Park, Kenya: One of thousands of dead flamingos on the dry lake bed. The number of flamingoes living on the lake has declined dramatically, a number of factors have been blamed including the receding waters of the lake, and pollution. Kirsty Wigglesworth / AP

World Water day gallery