Bats were found to have a vocal range of 7 octaves, nearly twice that of humans.
What is vocal range?
Vocal range, in its broadest sense, refers to the entire range of notes that a singer's voice is capable of producing, from the lowest note to the highest note. Range, then, is the difference between the highest and lowest notes a singer is capable of singing.
Three and a third octaves are typical for human vocal range.
Being put into one of these categories merely indicates where your voice is most naturally strong; it does not preclude you from singing other notes. These vocal range categories are bass, baritone, tenor, alto, mezzo-soprano, and soprano, in that order.
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