A central Japan aquarium offers a rare glimpse of sea otters floating on their backs and using rocks like masterful chefs to crack open clams, mussels and other shellfish treats.However, unfortunately, the opportunity is nearing its end and signaling wider concern for the species.People flock every day to the Toba Aquarium in Mie Prefecture to see the last two remaining sea otters in captivity in Japan. They hope to get an up-close look at the cute mammals and their playful antics.In recent years, the wild sea otter population has plummeted as hunters have targeted the animal for its dense …READ FULL ARTICLE