Humans can hear sound at frequencies from 20Hz to 20,000Hz.
Any sound under 20Hz is called infra sound and any sound above 20,000Hz is called ultra sound.
Whales and elephants can hear sounds below 20Hz.
Bats can hear sounds up to 160,000Hz, that's why when a bat screeches we can't hear it.
Humans can hear best at 1,000Hz to 5,000Hz, because that's where human speech is centered.
Hearing Sounds at around 18,000Hz to 20,000Hz can lead to Hearing loss.