Fireflies are a harbinger of summer – a sign that the season has finally arrived. Many of us in southwest Ohio have treasured childhood memories of catching lightning bugs during humid summer nights, their glow illuminating our yards and porches. Unfortunately, the magic of fireflies is fading as their populations decline across the world. The good news is that we can support fireflies and help boost their numbers right from our own homes! Read more to learn about these special insects, and the part you can play in ensuring their survival.

An Insect with Many Names

First, what is a firefly? Fireflies, or lightning bugs, are a type of beetle, not a fly, as their name suggests. There are over 2,400 species of these insects worldwide, and around 25 different species of fireflies in Ohio. The scientific name for the lightning bug family is Lampyridae, which means “shining light” in Latin. Their signature flashing glow is a type of bioluminescence, a chemical reaction within their bodies that produces light.

The lightning bug’s life cycle is similar to other beetles, and they develop in four stages: egg, larva, pupa, and adult. Fireflies spend most of their lives in the larval stage, which requires moist environments like rotting logs and leaf litter to thrive. Lightning bug larvae can glow, and they use bioluminescence to defend themselves against predators. Once fireflies emerge as adults in the summer, they typically live between 2-4 weeks. Adults use bioluminescence to find mates or attract other fireflies to eat.

Finding Fireflies

Firefly habitat is very important – it has to be just right to support each stage in their life cycle. Lightning bug larvae feed on slugs, snails, and worms, which live in moist areas like fallen leaves and logs. Adults eat other fireflies, plant nectar or pollen, and, sometimes, nothing at all during their short adult lifespan. Native plants help support lightning bugs by providing shelter, food, and the healthy habitat they need to complete their life cycle. You can find these conditions in many of the MetroParks, but also in your own yards and neighborhoods.

Threats to Lightning Bugs

Lightning bug populations across the globe are in decline, and scientists have identified several contributing factors.

The world is slowly turning firefly habitats into human ones. As the forests and prairies that once supported fireflies are developed, the insects lose the spaces and conditions that they need to live and reproduce successfully.

Shorter and milder winters disrupt the insect’s reproductive timing, causing lightning bugs to reach adulthood too early or too late and missing the window to find a mate.

Artificial lights like street lamps, headlights, and house lights cause harmful light pollution. Around 3/4 of firefly species are active at night and require dark conditions to find their mates. Human-created light impacts the ability of lightning bugs to find mates, ward off predators, or find food.

Pesticides and herbicides can kill firefly larvae, which cannot move away from treated areas. They also decrease the insects’ food sources and habitats.

How You Can Help

There are some easy steps you can take at home to help these animals survive and create summertime magic for future generations.

Create cover and leave debris – Leave your leaves! Fallen leaves make great homes for firefly larvae and their food sources.

Reduce or eliminate pesticide use – Decreasing or stopping pesticide use on your property is one of the highest impact and lowest effort ways to help create safe habitats for lightning bugs.

Keep it dark – Turning off your porch and yard lights creates darker conditions that help fireflies successfully mate and hunt.

Plant native – Indigenous plants provide high-quality habitat and support the animals lightning bugs rely on for food. Native plants also help to retain soil moisture, which improves soil quality and firefly habitat.

Protect wet areas – Wet and damp areas are needed for fireflies to survive their larval stage. Even something as small as a puddle can help create conditions that the insects need to thrive.

Certify Your Yard

Visit Firefly.org for more tips on supporting fireflies in your own backyard, and learn more about certifying your space as an official Firefly habitat!