Birds, fish, and arthropods are among the animals that can distinguish linearly polarized light. For insects, perceiving the diurnally changing orientation of polarized light - called E-vector analysis - is a way to assist navigation. Stanley Heinze and Uwe Homberg, animal biologists at Philipps University in Germany, looked at locusts and uncovered the neural structure responsible for E-vector analysis - the protocerebral bridge located in the center of their brains.
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