Squirrels have fuzzy tails.
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The bacteria themselves are quite interesting. They produce their own magnetite crystals, which they use to navigate along the Earth’s magnetic field lines looking for nice places to live. They can somehow tell which way they’re going, and they also respond to light, persistently swimming parallel to magnetic field lines when illuminated. It looks like this is how such precise motion is achieved: by changing magnetic fields and illumination, the external computer is able to direct the bacteria exactly where to go.