These 15 Photos From Smithsonian Magazine's Photo Contest Will Take Your Breath Away, Guaranteed

"Sardines emerge from a coral wall in cobalt waters just a few yards from the shores of Cebu Island in the Philippines. They move in a single undulating cloud of silver that twists, turns, shrinks, expands, and wraps itself around any object that gets in its way. At times, it becomes a thundercloud, blocking out the sun or clapping violently as it suddenly flips its formation to evade a predator."