Seabirds racing home over the ocean can get jet-lagged

A study on Manx shearwaters, seabirds that fly across the North Atlantic, found that they experience jet lag due to their long flights across multiple time zones. This jet lag affects their internal clock, which is used for navigation by the Sun, causing them to skew their compass. The birds recalibrate their internal clock at every dusk and dawn, but this process is not perfect, leading to navigation errors. The study suggests that the birds' internal clock is not as accurate as previously thought, and that their navigation system is more complex than previously believed.