The Inner Map
No one knows exactly how migrating birds find their routes and return to the same destinations year after year. Theories include the use of celestial navigation, magnetic influences and other visual cues. Other theories suppose that a kind of inner map is programmed into their genetic code or that baby birds follow their parents and that first migration imprints a map in a particular part of their brains that they carry for the rest of their lives. Read more in my blog post.