ScienceNow:
Who needs a GPS when you have, well, whatever migratory birds
and sea turtles have? For centuries, humans have marveled at
the ability of these and other animals to navigate the globe,
in some cases returning to the same breeding spot year after
year from as far as 15,000 kilometers away. How they find their
way remains a mystery, but new research suggests their prowess
may depend on the ability to "see" Earth's magnetic
field.
