Travelers of the animal world

Arctic terns fly from the North Pole to the South Pole, salmon swim upstream to return to their spawning grounds, and the magnificent monarch butterfly makes an incredible journey so long that it takes three generations to complete. Animal migration is one of the greatest wonders of the natural world. Some are born with a map etched into their genes and use sophisticated navigation systems, while others can estimate distances from the position of the sun or sense the Earth's magnetic fields. Informative fold-outs and colorful illustrations help you chart the migrations of 14 fascinating animal travelers, so you can explore the world with them.