The 2 GPS' of the sea
Many sea animals, such as sharks and turtles, travel huge distances throughout the year as part of their migration. They are able to go across the whole ocean and yet still not get lost. In fact, sea turtles almost always are able to find the exact same beach they were born on, after traveling thousands of miles away. How do they do this? Both animals use the Earth's magnetic field. To make sure that sharks used the Earth’s magnetic field, Bryan Keller of Florida State Univer