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Bats can't distinguish things with their eyes. The experimental data in the original table show that the percentage of blindfolded bats hitting obstacles is normal. Bats use their ears to distinguish things: the table shows that few bats cover their ears to avoid obstacles. Bats see things through their ears: for the same reason. Bats talk with their mouths: for the same reason. Bats can tell things by their mouths and ears.