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Crickets don't have ears like we do. Instead, they have a pair of tympanal organs on their legs, which vibrate in response to vibrating air molecules (sound) in the surrounding air. A special receptor called the chordatal organ translates the vibration from the tympanal organ into a nerve impulse, which reaches the cricket's brain. The cricket, ever on the alert for predators, responds to this message by doing what it can to hide – it goes silent.
Crickets are extremely sensitive to vibration, so I'm not surprised that it reacts to your movements, however softly you try to get out of bed and sneak up on it.
Only male crickets chirp, by the way. The males make that chirping sound by rubbing the edges of their forewings together. They chirp to call for female mates. Since most predators are active during daylight hours, crickets chirp at night.
Apparently, as male crickets heat up, they chirp more rapidly. By counting the chirps, especially of one species, the Snowy Tree Cricket (Oecanthus fultoni), you can get a fairly accurate temperature. Here’s how:
Find yourself a cricket (a chirping one will be a male. A Snowy Tree Cricket (seen here) is the most accurate, but in a pinch, any cricket will do)
Count the chirps in a 14-second interval
Add “38″ to the total
That’s the current temperature, in Fahrenheit
The discoverer of this phenomenon, known as Dolbear’s Law, was American physicist and inventor Amos Dolbear, in 1897.