A large proportion of the bat ' s auditory receptors ( hair cells in the cochlea ) and large areas in the bat ' s brain are devoted to analyzing a narrow frequency range corresponding to a single harmonic of the returning echo 蝙蝠用很大一部分的聽覺受器(耳蝸中的毛細胞)與大幅的腦部區(qū)域,來分析一段?圍狹窄的頻率,該頻率正與回聲的一個諧波相符。