Migrating birds navigate by sensing Earth's magnetic field, but the exact mechanisms at work are unclear.
The idea that
migrating birds navigate across continents and oceans with the help of an internal compass had been suggested a century earlier by a Russian zoologist, but attempts to prove it had failed.
This was in the late 1950s, and the thinking at the time was that
migrating birds navigated using the sun, moon and stars.
Not exact matches
Even resident
birds that do not
migrate in the spring and autumn have a magnetic sense and
navigate using their internal magnetic compass.
And many
birds have to
navigate thousands of miles twice a year to
migrate.