Migratory birds can use Earth’s magnetic field like a GPS

Eurasian reed warblers don’t just get a sense of direction from Earth’s magnetic field – they can also calculate their coordinates on a mental map

​Eurasian reed warblers don’t just get a sense of direction from Earth’s magnetic field – they can also calculate their coordinates on a mental map Eurasian reed warblers don’t just get a sense of direction from Earth’s magnetic field – they can also calculate their coordinates on a mental map