Bird brains can flick switch to perceive Earth's magnetic field  

PHYSorg
May 25, 2023, 8:10 pm229 pts
Earth's magnetic field, generated by the flow of molten iron in the planet's inner core, extends out into space and protects us from cosmic radiation emitted by the sun. It is also remarkably used by animals like salmon, sea turtles and migratory birds for navigation.

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