How do birds navigate long range in the movie the core?

In the movie "The Core," birds navigate long distances using their ability to sense the Earth's magnetic field. The film suggests that disruptions in the Earth's core can affect this magnetic field, leading to disorientation among birds. This concept is fictionalized for dramatic effect, aligning with the movie's themes of catastrophic geological events. Ultimately, the portrayal emphasizes the connection between natural phenomena and animal behavior.