Study challenges long-held theories on how migratory birds navigate

Migratory birds are known for their ability to traverse thousands of kilometres to reach their breeding or wintering grounds. Research found that these birds, in this case, Eurasian reed warblers (Acrocephalus scirpaceus) are using only the Earth's magnetic inclination and declination to determine their position and direction. This challenges the long-held belief that all components of the Earth's magnetic field, especially total intensity, are essential for accurate navigation.