Have you ever sat outside on a warm evening and heard a loud, buzzing noise echoing through your garden? It often sounds like a tiny machine running right in your trees. If you have ever wondered what makes that steady humming sound, you are not alone. The creature behind this famous evening music is the cicada. You might not know its name very well, but these fascinating insects live all around the world. Rest assured, once you look past their loud volume, cicadas are completely harmless creatures that bring a unique rhythm to nature.
This complete medical and nature guide will walk you through everything you need to know about cicadas. Written for patients, families, and curious nature lovers, this article breaks down their biology, behavior, and garden impact into simple terms. We will explore their amazing underground lifecycle, look at different species, and explain why they pose zero risk to you or your pets. Let us dive in and learn all about these noisy little bugs.
Key Takeaways About Cicadas
- Cicadas are large insects famous for the loud buzzing sounds that male bugs make during warm weather.
- They do not bite, sting, carry venom, or spread diseases to humans or household pets.
- Their unique lifecycle involves spending years underground as nymphs before emerging as winged adults.
- You can protect young garden trees from egg-laying damage simply by using lightweight mesh or cheesecloth.
- Avoid using chemical pesticides against cicadas because they harm other helpful insects and local wildlife.
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What is a Cicada?
Simply put, cicadas are a widespread family of insects that emerge during warm weather months. The easiest way to spot these bugs is by listening to their loud calls. When it comes to their physical appearance, different species vary slightly in size and color. However, most adult cicadas share a distinct set of physical traits.
To help you identify them easily, here is a quick breakdown of their physical body parts:
| Body Part | Detailed Description |
|---|---|
| Body Structure | They have a tough, sturdy body that looks somewhat like a robust beetle. |
| Wings | They possess four clear wings with visible vein patterns. The front wings are longer than the back ones. |
| Antennae | They feature very short, delicate antennae positioned right on their heads. |
| Sound Organs | Male cicadas have specialized ribbed membranes under their abdomens to create their loud calls. |
| Egg-Laying Organ | Females possess a pointed, tube-like organ called an ovipositor used for laying eggs. |
A Truly Amazing Lifecycle
The lifecycle of a cicada is one of the most remarkable processes in the natural world. A female cicada uses her pointed egg-laying organ to slice tiny slits into tree branches. She then lays her eggs safely inside these plant tissues. Once the tiny nymphs hatch from these eggs, they right away drop to the ground. They burrow deep into the soil and begin their long underground life.
Just imagine living underground for years in total darkness. These young nymphs feed entirely by drinking nutrient-rich sap from plant roots. When their time underground finally comes to an end, the nymphs crawl back up to the surface. They climb up the nearest tree trunk or garden fence to begin their final transformation.
During this stage, the nymph splits open its outer shell and crawls out as a fully winged adult. You can often find these hollow, crunchy brown shells clinging tightly to tree bark in your yard. Just a few days after reaching adulthood, male cicadas start singing their famous calls. This loud song serves as a special invitation to attract female mates.
After mating, the female lays her eggs to start the cycle all over again. Depending on the species, a single female can lay up to six hundred eggs in her lifetime. Once they emerge above ground as adult insects, cicadas only live for a short period of about three to four weeks.
Main Types of Cicadas
Even though there are many different kinds of cicadas found around the globe, experts generally divide them into two primary groups. Understanding these groups helps explain why you hear them at different times of the year.
1. Annual Cicadas: These insects get their name because a new group emerges every single year. Even though their underground nymphs spend two to five years growing beneath the soil, their overlapping generations ensure you hear them annually. These common types usually feature green, brown, and dark colors that blend into tree bark.
2. Periodical Cicadas: These are truly unique creatures. Periodical cicadas spend an incredible thirteen or seventeen years underground. When their biological clock goes off, millions of them emerge from the soil all at once. This massive emergence ranks as one of the most astounding natural events on Earth. However, they are mainly found in specific regions like North America rather than globally.
Scientific research suggests that staying underground for such long, prime-number years helps these insects confuse predators. By emerging in overwhelming numbers all at once, they ensure that predators cannot eat them all.
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Check Availability →Do Cicadas Pose Any Danger to Us?
This is the most important question for families and pet owners. Even though the loud buzzing noise can sometimes feel overwhelming, cicadas present absolutely zero danger to humans. They will not hurt you, your children, or your household pets like dogs and cats.
- Cicadas do not bite humans. Their mouthparts are designed strictly for drinking plant sap, not for piercing skin.
- They are not poisonous or venomous. If a curious pet happens to eat one, it will not get poisoned.
- They do not spread diseases. They are clean insects that do not carry harmful germs or bacteria to people.
If a cicada accidentally lands on your arm or shoulder, there is no reason to panic. The insect poses no threat and is simply looking for a quiet place to rest. They are gentle creatures that only want to sing and complete their natural lifecycle.
The only minor issue cicadas can cause relates to garden plants. When female cicadas cut tiny slits in tree branches to lay eggs, those specific branches can experience minor damage. This impact affects young, newly planted saplings and delicate garden shrubs much more than mature trees.
What Should You Do? Practical Garden Tips
Because cicadas play an essential role in local ecosystems, you should never try to kill them off. Chemical insecticides should always be avoided. Spraying heavy chemicals harms cicadas along with many other beneficial insects like honeybees and butterflies. It also poisons the birds and small animals that rely on cicadas for food.
Instead of harsh chemicals, simply keep a close eye on any young, newly planted trees in your garden during peak seasons.
- Cover young trees: Wrap vulnerable saplings with fine garden netting or cheesecloth during peak cicada seasons to prevent females from reaching the branches.
- Prune damaged twigs: If you notice small twigs drying out after egg-laying, simply prune those branches away to keep your tree healthy.
- Delay new plantings: If you plan to plant delicate young trees, consider waiting until late summer or autumn after the loud cicada season ends.
When to Seek Emergency Help
Cicadas do not cause medical emergencies. However, if you or a family member experience severe allergic reactions from outdoor insect stings (such as wasps or bees sharing the same garden space), seek medical help right away. Call 911 in the US and Canada, 999 in the UK, or visit your nearest Emergency Department (ER or A&E) if you experience breathing difficulty, facial swelling, or dizziness.
Take-Home Message
Summary Points
- Cicadas create loud buzzing sounds that are completely harmless to humans and household pets.
- They do not bite, sting, or carry venom, so you never need to feel afraid of them.
- Loud evening sounds are simply male cicadas calling out to attract female mates.
- Young garden trees are the only plants that might need simple protective netting against egg-laying.
- Never use chemical pesticides to control cicadas because they damage the broader natural environment.
Sources & References:
- World Health Organization (WHO) - Environmental Health and Vector Guidelines.
- Centers for Disease Control and Prevention (CDC) - Safe Outdoor Living and Insect Awareness.
- National Health Service (NHS) - Outdoor Safety and Common Insect Encounters.
- Mayo Clinic - Insect Bites and Allergic Reaction Management Guide.
- National Institutes of Health (NIH) - PubMed Central: Ecological Roles of Periodical Cicadas.
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