 
 <prompt> Wetin you need book if you wan fly go another place? Given di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Theoretical analyses show say detours wey dey increase flight distance by up to 20% go often make sense for aerodynamic reasons - bird wey load itself with food to cross long barrier no dey fly efficiently. But some species dey show long, winding migratory routes wey no dey make ecological sense. For example, Swainson's thrush Catharus ustulatus wey dey migrate from continental populations dey fly far east across North America before dem turn south via Florida reach northern South America; dem believe say dis route na because of range expansion wey happun about 10,000 years ago. Detours fit also dey caused by different wind conditions, predation risk, or other factors. 