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They can hear higher-pitched sounds than humans or most dogs, detecting frequencies from 55 Hz up to 79 kHz. [17] [18] Cats do not use this ability to hear ultrasound for communication but it is probably important in hunting, [19] since many species of rodents make ultrasonic calls. [20]
Bottlenose dolphins: Dolphins can hear one another up to 6 miles apart underwater. [27] Researchers observed a mother dolphin successfully communicating with her baby using a telephone. It appeared that both dolphins knew who they were speaking with and what they were speaking about.
A CF tone is a narrowband signal: the sound stays constant at one frequency throughout its duration. [23] Echolocation calls in bats have been measured at intensities anywhere between 60 and 140 decibels. [24] Certain bat species can modify their call intensity mid-call, lowering the intensity as they approach objects that reflect sound strongly.
Whales use a variety of sounds for communication and sensation. [1] The mechanisms used to produce sound vary from one family of cetaceans to another. Marine mammals, including whales, dolphins, and porpoises, are much more dependent on sound than land mammals due to the limited effectiveness of other senses in water.
On the other hand, if a rat forages in the leaves and makes a sound that attracts a predator, the sound itself is a cue and the interaction is not considered a communication attempt. Air and water have different physical properties which lead to different velocity and clarity of the signal transmission process during communication. [ 4 ]
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Whistling is used by animals such as prairie dogs to communicate threats, with prairie dogs having one of the most complex communication systems in the animal kingdom. Prairie dogs are able to communicate an animal's speed, shape, size, species, and for humans specific attire and if the human is carrying a gun . [ 41 ]
Dolphin echolocation clicks are amongst the loudest sounds made by marine animals. [29] Bottlenose dolphins have been found to have signature whistles. These whistles are used in order for dolphins to communicate with one another by identifying an individual. It can be seen as the dolphin equivalent of a name for humans. [30]