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12.6 Acoustic Traps
The bat can determine its distance from the object with the help of the interval between the chirp and the return echo.
As the bat comes closer to the object, the duration of and spacing between chirps decrease, allowing the bat to locate the object more accurately.
In the final approach to the object, the chirps have a duration of about 0.2 ms and a spacing of about 5 ms.
Experiments show that bats can avoid wire obsta cles with diameters down to about 0.1mm, but they fail to avoid fine wires.
Some animals, such as porpoises, whales, and some birds, use echoes to locate objects, but they are not able to do so as well as bats.
Animals can make sounds.
Some insects make sounds by rubbing their wings together.
The rattlesnake makes a sound by shaking its tail.
The respiratory mechanism is associated with sound production in most animals.
The upper part of the trachea has two reeds attached to it.
The cords are open during normal breathing.
The cords are brought together to make a sound.
The air from the lungs moves through the space between the edges.
The sounds are determined by the tension on the vocal cords.
The voice's fundamental frequencies are 140 and 230 for males and females.
The sound produced by the vocal cords is altered as it travels through the mouth and throat.
The tongue is an important part of the final sound.
Outside of the vocal cords, the sounds of a whispering talk are produced.
The use of electronically generated sounds that mimic animals and insects is on the rise.
Commercial fishing lures are now available.
A device that mimics the distress call of a mackerel will attract larger fish to the fishhook.
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