The week from oceans to mountains we follow the paths of animal migrations. We start in Hawaii as Philippe joins a humpback whale research team to get up close and in the water with these majestic animals that swim thousands of miles each year to and from Alaska. Then it's into the Rocky Mountains to see how Jackson, Wyoming accommodates thousands of elk that migrate to this area each winter.  We finish in the Delaware bay where every year at a very specific time horseshoe crabs migrate to shorelines to breed and lay eggs.