While the term “sun bird” may first call to mind tropical animals, it here refers to the remarkable migratory habits of Arctic terns, who “experience more hours of sunlight than any other animal.” Born during the Arctic summer, tern chicks are fed and protected by adult terns from predators. They chase the sun south when summer ends, soaring over the ocean for a month, dodging skua birds and skimming the ocean for fish. Their destination is Antarctica; finally, they reach the Weddell Sea, where it is springtime. The terns live there all summer, resting among southern birds busy with their young. At the end of the season, when the sea begins to freeze, the terns return to the north, “following the sun … toward longer days and another polar summer.” Accessibly written and accompanied by lovely illustrations showing terns encountering various other species at home and sea, the account concludes with a timeline, a map of the Arctic tern’s global journey, and additional facts about these graceful birds.