We still have a lot to learn about how animals use magnetic fields. And how does magnetoreception even work? How animals navigate over long distances is still a great mystery, but scientists are on the case.
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New research has showed that the individual neurons in the brains of common pigeons could relay crucial information about the Earth’s magnetic field, potentially providing these animals with an internal GPS. 
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Individual neurons in birds' brains can relay crucial information about Earth’s magnetic field, possibly providing the animals with an ‘internal GPS’, according to research into magnetoreception.
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Discover how magnetism helps homing pigeons fly and amusement park rides operate.
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It has been known for a while that birds can count. What researchers have just discovered is pigeons can learn abstract numerical rules, according to a study published in the journal Science. What is astonishing is that pigeons, who learned to peck numbers on a screen in order, performed just as well in tests as rhesus monkeys at numerical competence.
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Scientists at Baylor College of Medicine have discovered 53 neuron cells in the small bird's brain that may actually make up a biological "GPS system," each with its own characteristic response to the Earth's magnetic field. The combined data of each neuron's reaction to its north-south and up-down orientation gives the pigeon not only an accurate compass heading, but may also give it coordinates on a mental map.
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The theory that pigeons' famous skill at navigation is down to iron-rich nerve cells in their beaks has been disproved by a new study published in Nature.
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