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Still Waters

Eye size determined by maximum running speed

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How fast an animal can run has a bigger impact on eye size than even the size of its body, according to new research from The University of Texas at Austin.

Previously it was thought that the time of day that an animal is active, whether nocturnal or diurnal, would be the main factor driving the evolution of mammalian eye size.

Comparative research on the anatomy of the eye has shown that although nocturnal and diurnal species differ in eye shape, they often have similar eye sizes.


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