Chirping of Cricket

Can you imagine a night without the very common chirping sound around you? or can you think of  a night scene in a horror or normal drama / cinema /theater without the chirping noise ? I think it can only  be compared to a cooked food without salt. 
In the lap of nature there are various types of living beings  with their unique identity. Cricket is one of those who creates a background music around us  from dusk to dawn.
The sound created by  crickets is referred to as chirping; the scientific name is stridulation. Only the male crickets chirp. The sound is created by the stridulatory organ, a large vein running along the bottom of each wing, covered with "teeth" (serration) much like a comb. The chirping sound is created by running the top of one wing along the teeth at the bottom of the other wing.

Crickets have tympanic membranes situated just under the middle joint of each front leg (or knee). This enables them to hear another cricket's song.

There are four types of cricket song: The calling song attracts females and repels other males, and is fairly loud. The courting song is used when a female cricket is near, and is a very quiet song. An aggressive song is triggered by chemoreceptors on the antennae that detect the near presence of another male cricket and a copulatory song is produced for a brief period after a successful mating.

The relationship between temperature and the rate of chirping is known as Dolbear's Law. According to this law, counting the number of chirps produced in 14 seconds by the snowy tree cricket common in the United States and adding 40 will approximately equal the temperature in degrees Fahrenheit.

Like all other insects , crickets are cold-blooded. They take on the temperature of their surroundings. For instance, crickets, like all other organisms, have many chemical reactions occurring within their bodies. As the temperature increases , it becomes easier to reach a certain activation or threshold energy, and chemical reactions, like those that occur during the muscle contractions used to produce chirping, happen more rapidly. As the temperature falls, the rate of chemical reactions inside the crickets' bodies slow down, causing characteristics, such as chirping, to also slow down.

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source : scientific Magazines , wikipedia , etc .