Humans may believe that they are the greatest explorers in the world, but they are not. Millions of animals migrate across the globe every day on paths that have been used for centuries. As they soar, fly, and swim from the Antarctic to the African Savanna and the Pacific Ocean to Alaska. This series immerses viewers in the action. Join the devoted mother humpback who is watching over her young calf, the small dung beetle, the monarch butterfly, the persistent barn swallow, and many other species. These intrepid travelers navigate thousands of miles during the course of their lives by using the Earth's magnetic field, stars, moon, ocean currents, and their natural senses on land and in the sea. Join Jeremy Renner as he recounts the most extreme adventure.