Supernavigators

How do animals find their way? How does a bird leave its nest to find food? How does a humpback whale follow an arrow-straight course while it crosses an entire ocean? How does an Arctic tern travel 56,000 miles a year without getting lost? We know some things about how animals accomplish these remarkable feats of navigation. Monarch butterflies travel from Canada to Mexico by orienting to the sun. It's the light from the Milky Way that steers dung beetles. Then, there are animals like moth