8:44:27 
2023-04-20 
714
Bats can see as well as humans can, but they have evolved a sophisticated method of using sound that enables them to navigate and find food in the dark called echolocation. Bats produce echolocation by emitting high frequency sound pulses through their mouth or nose and listening to the echo. With this echo, the bat can determine the size, shape and texture of objects in its environment. Bat echolocation is so sophisticated that these animals can detect an object the width of a human hair.
Bats can be broadly characterized by their echolocation calls as shouting bats and whispering bats. Big brown bats and little brown bats are shouters and produce sounds (if we could hear them) of 110 decibels or similar to the loudness of a smoke alarm. Northern long-eared bats are whispering bats and produce sounds of 60 decibels (similar to the levels of normal human conversation). Shouters tend to forage for food in open spaces; whisperers glean insects from the foliage of trees and forage in the cluttered environments of forest interiors.
About 70% of all bat species worldwide have this ability. Also, bats aren't the only animals that use echolocation. Whales, dolphins, porpoises, oilbirds and several species of shrews, tenrecs, and swiftlets use a similar technique.
Most bat echolocation occurs beyond the range of human hearing. Humans can hear from 20 Hz to 15-20 kHz depending on age. Bat calls can range from 9 kHz to 200 kHz.
Some bat sounds humans can hear. The squeaks and squawks that bats make in their roosts or which occur between females and their pups can be detected by human ears, but these noises aren't considered to be echolocation sounds.
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