Some of Earth’s creatures are capable of extraordinary migrations , covering thousands of kilometers every year. But how do they know which way to go? For loggerhead sea turtles ( Caretta caretta) the answer to that question rests inside their ability to detect the Earth’s magnetic field – but how are they doing this? The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

There are two ways that animals have been found to be able to sense Earth’s magnetic field. Either the turtles possess light-sensitive molecules that are affected by the field and allow the animals to see it; or, there are tiny magnetite crystals inside the turtles' bodies that move in the field and allow them to feel magnetism.

To find out more about how the turtle

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