Biological GPS

Biology is an amazing subject, particulary zoology.  Animals have a wide variety of methods of surviving.  Perhaps one of the most interesting things animals can do is navigate the world. 

When Loggerhead Turtles are hatched they race to the ocean first by heading towards the brightest lights on the horizon (thing about the moon glistening on the waters).  Then they head out to see by swimming perpendicular to the waves.  Once in open waters, they swim all the way around the Atlantic Ocean following the Gulf Stream and then back towards the US.  They actually come back to the exact beach where they were born.  They accomplish this with an ability to sense the magnetic field of the Earth.

Monarch Butterflies make mesmerizing migrations each year.  They also use magnetism to find their ways.

The SEED Magazine has an article on the topic here.