Hearing in Animals
Not all sounds are normally audible to all animals. Each species has a range of normal hearing for both loudness (amplitude) and pitch (frequency). Many animals use sound to communicate with each other, and hearing in these species is particularly important for survival and reproduction. In species that use sound as a primary means of communication, hearing is typically most acute for the range of pitches produced in calls and speech.
Frequencies capable of being heard by humans are called audio or sonic. The range is typically considered to be between 20 Hz and 20,000 Hz. Frequencies higher than audio are referred to as ultrasonic, while frequencies below audio are referred to as infrasonic. Some bats use ultrasound for echolocation while in flight. Dogs are able to hear ultrasound, which is the principle of 'silent' dog whistles. Snakes sense infrasound through their bellies, and whales, giraffes, dolphins and elephants use it for communication. Some Fishes have the ability of hearing due from the well-developed parts of their swim bladders. The "aid to the deaf" of fishes appears in some species such as carp and herring.
Certain animals have more sensitive hearing than humans which enables them to hear sounds too faint to be detected by humans.
Read more about this topic: Auditive Perception
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