A magical scene: a huge flock of flamingos dotting dark water like stars in the heavens. Icy promontories like gold-tipped fingers reach out into the lake, forming V-shaped bays with thick, striated cliffs. The mineral flats near the salt and soda lake create painterly washes of white and dark, when seen from above. This photo was taken by helicopter flying over Tanzania’s Lake Natron. Three-quarters of the world’s population of lesser flamingos breed near the salty, mineral-sourced waters; they flock there to feed on algae, which thrive in the alkaline lake.