Over 100 years ago, sea otters were hunted to the brink of extinction along Japan's coastline. But these adorably cute mammals are back and getting a welcome return in the northern prefecture of Hokkaido. Crowds line the cliffs of a remote cape to view 10 such creatures as they eat, care for their young and float on the water's surface as they sleep. But challenges remain. As their population increases, so will the effect on the area's marine resources, including clams, sea urchins and crabs.