[Why 2 ears?].

Having two ears instead of just one is advantageous in several respects. The danger of deafness is decreased, the auditory field is enlarged, spatial perception is possible on the basis of binaural disparities. Auditory deprivation presents as loss of discrimination over time in the unaided ear of individuals with a unilateral hearing loss. Earedness and ear preference ensure the choice of the dominant ear for definite actions like eavesdropping, telephone or listen.