Katydids, crickets, and cicadas are the three types of bugs primarily responsible for those classic summery insect noises you hear at night. Whether you find them calming, irritating, or either one depending on the scenario, here’s the story behind the loud chirping noises bugs make.
Rather predictably, many of the loud bug noises you hear have to do with mating. Whether the purpose of the sounds is to attract or ward off other insects, the bugs need to produce loud enough noises to be heard by any surrounding bugs in the area.
Male katydids produce a mating call by rubbing their wings together, which is known as “stridulation.” It produces a buzzing or pulsing-type noise.
Sure, the sound of crickets chirping is synonymous with an awkward or eerie quiet, but the sound itself is actually pretty loud! A big part of the reason bug noises sound so loud to our ears is because of the frequency they’re at.
While the higher frequency of katydid noises produces a buzzing sound, the “low and pure” frequency of cricket noises registers as more of a “musical” chirp to human ears, according to Terminix. The noises crickets make also help attract potential mates, and only males make the noises. Like katydids, crickets rub their wings together to produce these sounds.
And the sounds get complicated! “The front wings are modified not only to create sound but to amplify and broadcast it, too,” Insectlopedia reports. “A ‘calling song’ attracts females from a distance. A softer ‘courtship song’ woos her at close range; and a ‘rivalry song’ rebuffs competing males.”
As with the other bugs, only male cicadas produce the sounds. Also like crickets, the sounds aren’t just to attract mates but also to ward off other male bugs, or even send out distress calls, according to Terminix.
A big aspect that differentiates cicadas from katydids and crickets is that cicadas don’t use stridulation; they use noise-making organs called tymbals located on their abdomens.
Not only do cicadas produce the loudest noises of these three insects, but they also have their eardrums located right near the tymbals. Luckily for them, though, they can fold their eardrums closed while producing the sounds, to protect their own hearing.
The cicadas’ noises need to carry from tree to tree, according to Terminix, so they need to have a high volume! Of course, bugs do more than just make noise, especially in the warmer months, and here’s how to identify what bug bit you this summer.