Right now, as you read this, fireflies are lighting up dark places all over Earth. Some people think fireflies only show up in June or July. That is not true. August is a busy month in the firefly calendar. The types of fireflies you see depend on where you live.
Over the last few days, citizen scientists on Alitaptap uploaded sightings from four continents. People reported glowing beetles in parklands, dark forest trails, quiet backyards, and damp meadows. Some of these fireflies flash yellow lights in the air while flying over lawns. Others stay on the ground and glow with a soft green beam that never turns off. Some live in places where summer is ending. Others live where it is warm all year long.
This article takes a trip around the world to look at what fireflies are doing right now in mid-August. You will learn which species are active near you, what to look for after sunset, and how to help scientists track them.
North America: Late Summer Flashers
In North America, August brings late summer evenings. The air is warm at night, but the sun sets earlier than it did a month ago. In backyards and city parks from Wisconsin to North Carolina, the Common Eastern Firefly is still going strong.
Its scientific name is Photinus pyralis. Between August 5 and August 8, Alitaptap members spotted them across many states. Reports came in from New York, Wisconsin, Tennessee, Pennsylvania, and Ohio. Even in big cities like New York, people saw them glowing at Brooklyn Bridge Park and along Walker Street.
How do you identify a Common Eastern Firefly? Watch how it flies. The male flies low over grass, usually a few feet off the ground. As he lights up, he flies upward in a short curve. The light looks like a glowing letter J. He turns his light off, drifts lower, and does it again. If a female sitting in the grass likes his flash pattern, she flashes back from below.
The Common Eastern Firefly is not the only species out right now. In Florida, observers at Loblolly Woods Nature Park in Gainesville logged the Tropic Traveler. In Texas, observers reported Pleotomus pallens in Wood County. These sightings show that late summer has a wide variety of fireflies if you look closely.
As August turns into September, many adult Common Eastern Fireflies reach the end of their lives. They only live as flying adults for a few weeks. Their main job is to find a mate and lay eggs in moist soil. Soon, their eggs will hatch into tiny larvae that live underground and hunt soft prey like snails.
Europe: Green Stars in the Grass
Cross the Atlantic Ocean to Europe, and you will see something very different. European fireflies do not usually put on high-flying light shows in the treetops. Instead, the most common species is the European Glow-worm (Lampyris noctiluca).
In early August, observers logged glow-worms across Europe. Reports came in from France, Germany, Switzerland, Italy, and Finland. In Germany, people spotted them in towns like Bismark, Gommern, and Rottleben. In France, sightings came from Pont-de-Larn and Plouider.
Despite the name glow-worm, these creatures are not worms. They are beetles. But there is a huge twist. The adult female European Glow-worm does not have working wings. She cannot fly into the air. Instead, she climbs up a tall blade of grass or a wooden fence post after sunset. Then she turns on a bright green light at the end of her body.
The light does not flash on and off. It shines continuously, like a tiny green LED sitting in the grass. The male glow-worm has wings and large eyes. He flies through the dark looking for those steady green lights below. When he sees one, he lands next to the female.
In Italy, volunteers also logged a related firefly called Lampyris fuscata fuscata. In Finland, observers logged glow-worms in Kanta-Häme. Even in northern Europe where nights are getting cooler, female glow-worms are still climbing plant stems to shine their green beams into the night.
Asia: Forest Walkers and Window Fireflies
Now let us travel east to Asia. August brings warm, humid weather and rain to many parts of East Asia. Fireflies love moisture because wet soil keeps their prey alive and keeps their delicate bodies from drying out.
In Hong Kong, Alitaptap observers recorded Pyrocoelia lunata in the Tai Po Kau Nature Reserve along the Brown Walk trail. This species lives in shaded woodland paths where tall trees keep the forest floor dark and damp. These fireflies use light to communicate under the dense forest canopy where moonlight cannot reach easily.
Farther northeast in Taiwan, observers in Yunlin County logged the Rimmed Window Firefly on August 8. Window fireflies get their unusual name from clear panels on their thoraxes. Those are the shield-like covers behind their heads. These see-through panels look like tiny windows.
In Asia, firefly species show amazing variety. Some species fly during the day, while others have lifecycles linked to forest streams. Observing fireflies in Asian forests requires patience. You often need to walk quietly along dark trails and search near low bushes or trickling water.
South America: Winter Lights in the Tropics
When it is August in the Northern Hemisphere, it is summer in North America and Europe. But south of the equator, August is actually late winter. Does that mean fireflies in South America are all asleep? Not at all.
Near the equator, temperatures stay warm all year long. In Macapá, Brazil, located right in the Amazon region, Alitaptap members logged Aspisoma lineatum on August 7. Another observer logged the same species in Asunción, Paraguay.
Aspisoma lineatum belongs to a group of fireflies known for flattened, oval bodies. Many Aspisoma species live in tropical wetlands, riverbanks, and warm grasslands. Because tropical forests do not freeze in August, insects stay active during months that would be cold in Canada or Northern Europe.
These South American reports show that firefly seasons are different all over the globe. While North American fireflies are winding down their summer season, tropical species keep glowing right through August without stopping.
How to Observe Fireflies Tonight
No matter where you live, you can participate in firefly science tonight. You do not need expensive equipment. You just need your eyes, a dark space, and a notebook or smartphone to record what you see.
Here is how to get ready for a firefly watch:
First, choose the right location. Look for lawns, garden edges, forest borders, or near ponds. Fireflies love places where long grass meets open spaces.
Second, minimize artificial light. Outdoor lamps, streetlights, and porch lights make it hard for fireflies to see each other's signals. Turn off porch lights. If you need a flashlight to walk safely, cover the lens with red cellophane. Fireflies cannot see red light well, so red light will not disturb them.
Third, give your eyes time to adapt. When you step outside from a lit room, your eyes need about 10 to 15 minutes to adjust to the darkness. Sit quietly and wait.
Fourth, notice the details. Is the firefly flying or sitting on the ground? Is the light yellow, green, or orange? Does it flash in short bursts, steady glows, or a J-shape curve?
When you return indoors, log your findings on Alitaptap. Note the date, time, location, and what the flash looked like. Even if you see zero fireflies, that is still valuable scientific data! Knowing where fireflies are missing helps scientists protect their habitats. Grab a dark shirt, head outside after twilight, and see what is glowing in your neighborhood tonight.