Day 4, 9 am, Cocha Cashu, Manu National Park, Peru. The water boils and churns as nine endangered giant otters vigorously pursue a school of fish. One otter swims under and up, sending a spray of panicked boca chicos into the air. Another bursts from the water and I see it twist and snatch a fish in mid-air before both plunge back into the lake. Moments later, the otter resurfaces and, firmly grasping its prize between large, webbed feet, begins to devour it, head first and w