" Humans with perfect reception can hear frequencies between 20 wave cycles per second, or 20 Hz, at the low end to 20,000 Hz at the high end. The lowest note on a typical piano is 27.5 Hz, and the highest is about 4,186 Hz. Nonhuman animals have evolved different ranges of hearing, the widest "

― Bernie Krause , Sounds from The Great Animal Orchestra (Enhanced): Air