How Do Animals Find Their Way Home Without GPS?

Animals travel hundreds of kilometers without GPS, but how? Understanding the earth's magnetic field might be the ultimate travel tip.

How GPS Works - http://bit.ly/1UyXfmp
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How dogs find their way home (without a GPS)
http://www.sciencealert.com/how-dogs-find-their-way-home-without-a-gps
"From the skill of racing pigeons to find their way home, to the seasonal breeding migration of the humpback whale, a huge range of creatures are capable of navigating in a consistent, precise and effective way."

Why humans can't navigate out of a paper bag
https://www.newscientist.com/article/mg20327211-000-why-humans-cant-navigate-out-of-a-paper-bag/
"THE journey seemed simple enough, on the map anyway. Allison Fine left her home to drive to Vermont, just a few hours north on a major highway. She had studied the route and had a GPS gadget to help her. Nevertheless, she soon had absolutely no idea where she was."

All Can Be Lost: The Risk of Putting Our Knowledge in the Hands of Machines
http://www.theatlantic.com/magazine/archive/2013/11/the-great-forgetting/309516/
"a hundred years ago, the British mathematician and philosopher Alfred North Whitehead wrote, 'Civilization advances by extending the number of important operations which we can perform without thinking about them.'"
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