Caribou at Teshekpuk, Single File
A herd of caribou cross the vast plain of Alaska's Tesehkpuk Lake, the largest lake in the Arctic. Tesehkpuk is home to one of the great caribou herds, as well as the destination for some of the largest flocks of migratory birds on earth. Though lacking photogenic landscape features, the vast tundra here is iconic of America's great wilderness. In May, pregnant females are on the move and waiting to give birth to their calves. Traveling single-file saves energy so each caribou does not need to break its own trail.