Sun Bird: The Amazing Journey of the Arctic Tern

With bodies home to hollow bones and weighing about the same as a handful of sand, Arctic terns are designed for flight. And fly they do. These remarkable animals migrate an astonishing 18,000 miles—from pole to pole and back again—each year. Along the way they encounter danger, weather, other migratory animals, and a wide range of ecosystems and habitats. Because they chase the sun, ornithologists speculate that the Arctic tern enjoys more hours of daylight than any other animal on Earth.