TO BE AS BLIND AS A BAT

TO BE AS BLIND AS A BAT MEANS THAT YOU ARE COMPLETLY BLIND. BATS ARE NOCTURNAL MAMALS SO THEY HAVE EVOLVED TO A PERFECT LISTENING SYSTEM. THEY MOVE USING ECHOES, LIKE A SUBMARINE UNDER THE WATER, SO THEY DON'T NEED TO HAVE AN EAGLE EYE.

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