That deafening summer buzz you hear from trees isn't coming from hundreds of insects rubbing their legs together. It's the sound of male cicadas singing with one of nature's most sophisticated instruments.
Cicadas make noise using a specialized organ called a tymbal located in their abdomen. Rapid muscle contractions cause the ribbed tymbal membrane to buckle inward and outward, creating clicking vibrations that their hollow abdomen amplifies into the loud buzzing sound we hear. Only male cicadas produce this sound, primarily to attract female mates.
I've spent countless summer afternoons tracking down these sound masters to understand their mechanism. What I found surprised me. Cicadas are actually the loudest insects on Earth, with some species reaching over 100 decibels at close range.
This guide breaks down exactly how cicadas produce their signature sound, why only males sing, and how they avoid deafening themselves in the process.
The Tymbal Mechanism: How Cicadas Produce Sound
Cicadas make noise using one of the most specialized sound-producing organs in the animal kingdom. Unlike crickets and grasshoppers that rub body parts together, cicadas use a completely different approach.
Tymbal: A ribbed, membrane-like organ located on the abdomen of male cicadas that produces sound through rapid buckling caused by muscle contractions.
The tymbal is essentially a biological drum. Each male cicada has two tymbals on the sides of his abdomen. These aren't simple vibrating membranes. They're complex structures with precisely spaced ribs that buckle in and out when muscles pull on them.
Think of it like popping a plastic bottle lid repeatedly. Each pop creates a clicking sound. When cicadas do this 300 to 400 times per second, those individual clicks blend into what we perceive as a continuous buzz or whine.
The Step-by-Step Sound Production Process
- Muscle Contraction: Strong tymbal muscles pull inward on the tymbal membrane, causing it to buckle
- Click Creation: The buckling action produces a distinct click as the ribs snap into a new position
- Muscle Relaxation: Muscles relax and the tymbal springs back to its original shape, creating another click
- Rapid Repetition: This cycle repeats 300-400 times per second, creating a continuous sound
- Amplification: The hollow abdominal cavity acts as a resonance chamber, magnifying the sound
What fascinates me is how efficiently this works. The tymbal muscles are some of the fastest contracting muscles in the insect world. They can fire repeatedly without fatigue, allowing cicadas to sing for hours without stopping.
How Cicadas Differ From Other Insects?
Most insects produce sound through stridulation. That's rubbing two body parts together, like crickets rubbing their wings together. Crickets have a file-like structure on one wing and a scraper on the other.
Cicadas don't stridulate at all. Their sound production is more like a drum being hit repeatedly than two surfaces rubbing together. This evolutionary difference allows cicadas to produce much louder sounds than their cricket cousins could ever achieve.
| Insect | Sound Method | Maximum Loudness | Who Sings |
|---|---|---|---|
| Cicadas | Tymbal buckling | 100+ decibels | Males only |
| Crickets | Wing rubbing (stridulation) | 50-60 decibels | Males only |
| Grasshoppers | Leg rubbing (stridulation) | 40-50 decibels | Males only |
| Katydids | Wing rubbing (stridulation) | 50-70 decibels | Males only |
Why Are Cicadas So Loud? Sound Amplification
The tymbal alone wouldn't produce the ear-splitting volumes cicadas are known for. The secret lies in how they amplify the sound. Nature has given cicadas a built-in sound system that any audio engineer would appreciate.
A cicada's abdomen is largely hollow and filled with air sacs. This space acts as a resonance chamber, similar to the body of an acoustic guitar or the hollow body of a violin. When the tymbal vibrates, the air inside the abdomen also vibrates, dramatically increasing the sound volume.
Quick Summary: Cicada loudness comes from three factors working together: the powerful tymbal mechanism, the resonating abdominal cavity, and the large surface area that projects sound outward. This combination can reach 100+ decibels.
The abdomen isn't just a passive amplifier. Cicadas can actually control its shape to some degree, changing the resonance characteristics and modifying their song. This allows them to produce different types of calls for different purposes.
Large species with bigger abdomens generally produce lower-pitched, more resonant sounds. Smaller species produce higher-pitched buzzes. The size of the resonance chamber determines the fundamental frequency of the call.
How Loud Are Cicadas Really?
When I stand next to a tree full of singing cicadas, the noise can be genuinely overwhelming. Some species can produce sounds over 100 decibels when measured from just a few inches away.
| Sound Source | Decibel Level | Comparison to Cicadas |
|---|---|---|
| Whisper | 30 dB | Much quieter |
| Normal conversation | 60 dB | Much quieter |
| Lawn mower | 85-90 dB | Similar loudness |
| Cicada chorus | 80-100 dB | Baseline measurement |
| Jackhammer | 100 dB | Similar at close range |
| Rock concert | 110-120 dB | Louder than cicadas |
What's remarkable is that an insect weighing a fraction of an ounce can produce sounds comparable to power equipment. This is possible because of the efficiency of their biological sound system and the fact that they're essentially living megaphones.
Why Do Cicadas Make Noise?
Cicadas don't make noise just for fun. Every sound they produce serves a specific purpose in their survival and reproduction. Understanding why they sing helps explain when and how they produce different sounds.
The primary reason cicadas sing is mate attraction. Male cicadas are essentially broadcasting their availability and fitness to any females in the area. A loud, steady song indicates a healthy male with good energy reserves. Females select mates based partly on the quality and characteristics of these calls.
I've observed that different situations trigger different types of sounds. The steady buzzing we all recognize is the mating call. But cicadas also produce other sounds for other purposes.
Types of Cicada Sounds
- Mating Call: The primary song used to attract females from a distance
- Courtship Call: A quieter, more complex sound used when a female is nearby
- Territorial Call: Used to warn competing males to stay away
- Distress Call: A chaotic sound produced when the cicada is attacked or captured
The mating call is what we hear during summer afternoons. It's designed to travel long distances and penetrate through forest canopy. Males often gather in groups called choruses, where they synchronize their songs to create an even more powerful signal that can travel up to a mile.
Did You Know? Some cicada species can modulate their song to avoid overlapping with other species. This allows multiple species to share the same habitat without confusing potential mates.
Territorial calls are more aggressive and irregular. When one male encroaches on another's singing perch, you might hear rapid bursts of sound followed by periods of silence. This is musical warfare, with each male trying to establish dominance.
Do Female Cicadas Make Noise?
This is one of the most common questions about cicadas. The short answer is no. Female cicadas do not have tymbals and cannot produce the loud buzzing sounds we associate with these insects.
Females are effectively silent from a distance. However, they do produce sounds when necessary. If a female is interested in a male, she may respond with wing flicks that create a clicking sound. This is typically only audible when you're very close.
The wing flick response is a signal to the male that he's found a receptive mate. At this point, the male will often switch from his loud calling song to a quieter courtship song. The pair may then engage in a brief back-and-forth of wing clicks and soft songs before mating.
The evolutionary reason for this division is clear. Females invest considerable energy in egg production. They need to be selective about mates, not spend their energy singing. Males compete for female attention, and their songs are the primary tool in this competition.
Annual vs. Periodical Cicadas: Sound Differences
Not all cicadas sound the same. The two main categories of cicadas in North America have noticeably different singing patterns and behaviors. Understanding these differences helps explain why some years are much noisier than others.
Annual cicadas appear every summer. These are the "dog day" cicadas we hear in July and August. Each species has its own distinct song, but most produce a steady buzz that can last for minutes at a time. Individual males may sing sporadically throughout the day.
Periodical cicadas are the famous 13-year and 17-year cicadas. When they emerge, they do so in massive numbers. Millions of insects can emerge in a single acre. The resulting chorus is overwhelming, a wall of sound that can make outdoor conversation impossible.
| Characteristic | Annual Cicadas | Periodical Cicadas |
|---|---|---|
| Life cycle | 2-5 years | 13 or 17 years |
| Emergence pattern | Every summer | Massive synchronized emergence |
| Sound intensity | Moderate | Extreme (millions singing together) |
| Geographic range | Widespread | Specific to brood locations |
| Season | Late summer | Spring (typically May-June) |
During a periodical emergence, the noise can reach levels that genuinely concern people. I've spoken to homeowners who worry the sound might damage their hearing or disturb their sleep. While the noise is certainly impressive, it's rarely at sustained levels high enough to cause hearing damage in humans.
Periodical cicada emergences are predictable events. Researchers track brood cycles and can tell you exactly which years will have massive emergences in which areas. These events are actually celebrated by many insect enthusiasts and scientists who study these remarkable creatures.
Can Cicadas Hear Themselves?
This question points to a fascinating problem. If cicadas are so loud, wouldn't they deafen themselves? The answer reveals more about cicada biology and their remarkable adaptations.
Cicadas can hear, but not with ears like ours. They have organs called tympana located on the underside of their abdomen. These are membranous structures that detect sound vibrations, similar to our eardrums but simpler in structure.
Interestingly, cicadas seem to have some ability to protect themselves from their own noise. Research suggests they may be able to temporarily disconnect their hearing while singing. This would be similar to plugging your ears before shouting. The exact mechanism isn't fully understood, but it appears to involve muscles that can dampen the tympanal membranes.
Cicadas also don't sing continuously. Even during peak chorus activity, individual males pause between songs. These rest periods give their hearing a break and may help prevent damage. The energy cost of producing such loud sounds is also substantial, requiring periodic rests to refuel.
Research Note: Scientists are still studying exactly how cicadas protect themselves from their own songs. The most widely accepted theory involves a combination of temporary hearing disconnection and physical dampening of the auditory organs.
What's clear is that cicadas can hear each other. Their songs are specifically tuned to frequencies that other cicadas detect easily. Females can distinguish between males of their own species and other species based solely on song characteristics. This selective hearing is crucial for successful reproduction.
When Do Cicadas Make Noise?
If you've ever wondered why cicadas seem louder at certain times of day, you're not imagining it. Cicada singing follows distinct patterns that relate to temperature, time of day, and weather conditions.
Most cicada species sing during the hottest part of the day. I've noticed that cicada activity typically peaks between mid-morning and late afternoon. This isn't random. Cicadas are cold-blooded, and their muscle function depends on body temperature. They need warmth for their tymbal muscles to contract rapidly enough to produce sound.
Temperature affects the song itself. Cooler temperatures produce slower songs with a lower pitch. As temperatures rise, the songs become faster and higher-pitched. This is why you might notice the chorus changing character throughout the day.
Weather also matters. Rain almost always stops cicada singing. The moisture may interfere with their sound production mechanism, and rain typically brings cooler temperatures that slow their metabolism. Wind can also suppress singing, possibly because it interferes with sound transmission and makes male-female communication less effective.
Some cicada species sing at dusk or even at night. These species tend to be in areas where daytime competition from other insects would make their songs less effective. Night-singing species often have different calls designed to travel in different acoustic conditions.
Common Myths About Cicada Noise
After years of observing and studying cicadas, I've heard many misconceptions about how these insects produce sound. Let's clear up some of the most common myths.
Myth: Cicadas make noise by rubbing their legs together.
Fact: Cicadas use tymbals on their abdomen. Crickets and katydids rub body parts together, but cicadas have a completely different mechanism.
Myth: Cicadas sing through their mouths.
Fact: Cicada sound comes entirely from the abdomen. Their mouthparts are for feeding, not sound production.
Myth: All cicadas sound the same.
Fact: Each species has a unique song. Some experts can identify species by sound alone. There are over 3,000 cicada species worldwide, each with distinct vocalizations.
Another persistent myth is that cicadas are locusts. They're completely different insects. Locusts are grasshoppers that can form massive swarms and devastate crops. Cicadas don't swarm and they don't eat crops. They feed on tree sap and don't cause agricultural damage.
The Evolution of Cicada Sound Production
Why did cicadas evolve such an elaborate sound production mechanism? The answer lies in their life cycle and reproductive strategy.
Cicadas spend most of their lives underground as nymphs. Some species live underground for 17 years before emerging for just a few weeks above ground. During this brief adult stage, they must find mates and lay eggs to ensure the next generation.
This creates intense evolutionary pressure. Males must attract females quickly. Females must choose mates wisely. The loud, distinctive songs evolved as an efficient way to broadcast presence and fitness across potentially large distances.
Interestingly, periodical cicadas may have evolved their long life cycles as a strategy to avoid predators. By emerging in overwhelming numbers all at once, they simply flood the environment with more food than predators can consume. The loud chorus may be part of this strategy, confusing predators with wall-of-sound tactics.
The tymbal mechanism represents an elegant evolutionary solution to the problem of long-distance communication. It's efficient, powerful, and allows for species-specific songs that prevent crossbreeding between different cicada types.
Frequently Asked Questions
How do cicadas make noise?
Cicadas make noise using specialized organs called tymbals located in the male abdomen. Rapid muscle contractions cause the ribbed tymbal membrane to buckle inward and outward, creating clicking vibrations. Their hollow abdomen amplifies these vibrations into the loud buzzing sound we hear.
Why are cicadas so loud?
Cicadas are loud because they combine a powerful sound-producing mechanism with an efficient amplification system. The tymbal produces the initial sound, while the hollow abdominal cavity acts as a resonance chamber that dramatically increases volume. Some species can reach 100 decibels, comparable to a lawn mower or jackhammer.
Do female cicadas make noise?
No, female cicadas do not produce the loud buzzing sounds. Only males have tymbals and can sing. Females are essentially silent from a distance, though they may produce faint clicking sounds with their wings when responding to males.
What is the purpose of cicada noise?
The primary purpose of cicada noise is mate attraction. Males sing to advertise their presence and fitness to females. Cicadas also use different sounds for territorial warnings, courtship once a female is near, and distress signals when threatened.
Can cicadas hear themselves?
Yes, cicadas can hear using organs called tympana on their abdomen. They appear to have mechanisms to protect themselves from their own loud songs, possibly by temporarily disconnecting their hearing while singing or dampening their auditory organs.
How loud are cicadas?
Cicadas can produce sounds between 80 and 100 decibels when measured close up. This is similar to the loudness of a lawn mower or passing motorcycle. However, at typical viewing distances, the sound is usually around 60-70 decibels.
What is a cicada tymbal?
A tymbal is a specialized sound-producing organ found only in male cicadas. It consists of a ribbed membrane on the abdomen that buckles inward and outward when muscles contract. This rapid buckling creates clicking sounds that blend into a continuous buzz when repeated hundreds of times per second.
Do cicadas make noise at night?
Most cicada species sing during the day when temperatures are warmest. However, some species do sing at dusk or during the night. Cicadas generally stop singing when it rains or when temperatures drop below their activity threshold.
Final Thoughts
Cicadas are more than just noisy summer insects. They're biological marvels with one of the most sophisticated sound-producing systems in nature. Their tymbal mechanism allows them to produce sounds that would be impressive for an animal many times their size.
The next time you hear that summer chorus, remember what's happening. Countless male cicadas are contracting specialized muscles at incredible speeds, buckling ribbed membranes hundreds of times per second, and amplifying the results through abdominal resonance chambers. All to attract a mate during their brief time above ground.
Understanding how cicadas make noise doesn't make the sound any quieter. But it does make it easier to appreciate the remarkable biology behind one of summer's most distinctive sounds.
