Cicadas are some of the most fascinating insects, known for their incredible life cycles, loud songs, and unique behaviors. Whether you’re a nature enthusiast, a student, or just curious about these mysterious creatures, this list explores ten compelling facts about cicadas that will deepen your understanding and appreciation for these remarkable insects.
1. Cicadas Have One of the Longest Insect Life Cycles
The periodical cicadas of North America, especially Magicicada species, spend 13 or 17 years underground developing as nymphs before emerging. During this time, they feed on sap from tree roots, growing slowly and hiding from predators. Their synchronized emergence after such a long period is a marvel of nature, designed to overwhelm predators and ensure species survival.
2. They Are Known for Their Loud Songs
Cicadas produce their distinctive calls using specialized structures called tymbals, which are drum-like membranes on their abdomen. Male cicadas sing to attract females, and some species’ calls can reach over 100 decibels—louder than a motorcycle. The sound is so loud that it can be heard from over a mile away during peak mating season, making cicadas one of the loudest insects on Earth.
3. Different Species Have Distinct Songs
Each cicada species has a unique song pattern, which helps males attract females of their own kind and avoid interspecies confusion. Researchers have even used these calls to identify and classify different cicada species. Some species, like the annual cicadas, have a more continuous and less synchronized song compared to the periodic cicadas’ massive choruses.
4. Cicadas Play a Role in Ecosystems
When cicadas emerge in massive numbers, they provide a vital food source for predators such as birds, mammals, and other insects. Their decaying bodies enrich the soil with nutrients, promoting plant growth. This cyclical boom-and-bust pattern significantly impacts forest and garden ecosystems, supporting biodiversity.
5. Cicadas Have a Unique Molting Process
As they transition from nymph to adult, cicadas undergo a molting process called ecdysis. They climb onto a plant or structure, then shed their exoskeleton to emerge as winged adults. This process can take several hours, and the new wings need time to expand and harden before the cicada can fly fully.
6. Some Cicadas Are Annual, Not Periodical
While Magicicada species are famous for their 13- or 17-year cycles, many cicadas emerge every year, known as annual cicadas. These species have overlapping generations, so their emergence is spread out across the summer months, providing a continuous chorus of insect songs.
7. Cicadas Are Found on Multiple Continents
Though most famous in North America, cicadas are present in Africa, Asia, Australia, and parts of Europe. Each region hosts different species adapted to local climates and ecosystems. For example, the Australian cicada species can be incredibly large, with some reaching over 2 inches in length.
8. Cicadas Have Been Featured in Human Culture for Thousands of Years
Cicadas appear in Asian art, Chinese poetry, and Japanese folklore as symbols of rebirth and immortality. Their distinctive sound has inspired composers and musicians, and they are often used in traditional music to evoke summer sounds and natural harmony. In some cultures, cicadas are also considered omens or symbols of change.
9. Cicadas Are Not Harmful to Humans or Plants
Despite their loud calls, cicadas do not bite or sting, and they pose little threat to plants. They primarily feed on sap from tree roots or branches and do not cause significant damage to healthy trees. Their presence is generally harmless and can even be beneficial by aerating the soil and supporting food webs.
10. Their Emergence Can Be a Spectacle
Every 13 or 17 years, cicada emergence events turn forests and urban areas into buzzing, shimmering displays of life. The sight of millions of cicadas emerging from the ground, paired with their synchronized chorus, is a natural phenomenon that draws tourists and scientists alike. These events highlight the incredible patience and timing inherent in cicada life cycles.
How to Choose
When selecting cicada-related experiences or specimens, consider the species’ behavior and environment. For example, if you want to observe the iconic 17-year cicadas, plan your visit during their emergence in late spring or early summer in regions like the Eastern U.S. The sound quality and size of cicadas vary among species, so choose based on whether you’re interested in their song, size, or ecological role. For collectors, ensure the species is ethically sourced and legal to own in your area.
Frequently Asked Questions
- Are cicadas dangerous? No, cicadas do not bite or sting humans. They are harmless and primarily focus on reproduction and feeding on tree sap.
- Why do cicadas emerge in large numbers? Emergence in huge swarms is a survival strategy called predator satiation, overwhelming predators and ensuring enough cicadas survive to reproduce.
- How long do cicadas live? Most adult cicadas live only 2 to 6 weeks, but their nymph stage underground can last from 2 to 17 years depending on the species.
- Can cicadas damage trees? Generally, cicadas do not harm healthy trees significantly. However, heavy feeding on young trees or branches can cause minor damage.
- Are all cicadas the same? No, there are over 3,000 species worldwide, each with unique songs, sizes, and emergence cycles, adapted to their environments.
- When is cicada season? Cicada season varies by region but typically peaks in late spring and summer when adults emerge to mate and lay eggs.
Final Thoughts
Cicadas are truly extraordinary insects that showcase nature’s marvels of timing, adaptation, and ecological importance. Their long underground lives culminate in spectacular emergences that captivate humans and support ecosystems. Understanding these fascinating creatures enriches our appreciation for the complexity and beauty of the natural world, reminding us of the intricate cycles that sustain life on Earth.
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