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Gerbils are desert burrowing animals, so I would think (I am not a biologist) that they have small ears to help reduce sand getting in their ears. They originated in Mongolia, which is between China and Russia (the old Soviet Union for those of us who are older), so it is colder there, so smaller ears would reduce heat loss as well. They are desert animals, but not all deserts are cold. :)

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15y ago

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