When a dog named Hank navigated 11 miles home over two days to his foster owner in Memphis, TN, recently, it had many of us thinking, “Awww, isn’t that sweet,” and marveling anew at the navigational powers of pets. How do these animals—without maps, GPS monitors, or the ability to ask for directions—find their way home?
Hank is hardly a fluke, either. In 2013, a cat traversed 200 miles over two months to reach its old stomping grounds. Meanwhile, seabirds and tortoises travel entire hemispheres when they migrate to the same old nesting areas season after season. As for how they do it, it depends on the species.
 

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