The room was pitch black as I lay in bed searching the darkness outside my window for the momentary flash of light. As a child, my excitement at seeing the first fireflies of the summer rivaled the anticipation of waiting for Santa or the thrill of waking up to the first snow of the season.

Now, each year I am transported back to my childhood when I first spy lightning bugs gracefully dancing in the darkness of the backyard.

It never ceases to amaze me, that split-second burst of brilliance in which I think my eyes are playing tricks on me. I stop, stand stock-still, and wait for the next twinkle, then another over by the edge of the lawn and yet another higher up near the first flash.

My heart soars, and I run inside to alert my family and insist that, they too, come to watch the show. To me it’s as impressive as the Perseid meteor showers that we watch from our roof, because these lights are alive and that seems even more special.

As children, we spent most of June and July with our maternal grandparents. It was our favorite time of year, filled with the freedom that only comes when you’re young and the summer promises to last forever.

My two older sisters took special delight in the pursuit of fireflies on balmy June evenings, carefully capturing them in a jar with tiny holes poked in the lid. Once they’d collected enough flies, they would silently sneak upstairs to my grandparent’s bedroom. Gently they would slip their jars under the light summer sheets and unscrew the tops, releasing the bugs. Then they would turn off the lights and watch as the sheets lit up in a beautiful ever-changing light pattern.

Racing back to their own bed, they would huddle together and attempt to stifle their giggles when my grandparents discovered the “gift” my sisters had left them. Leaving their windows open usually meant that more mosquitoes entered than fireflies escaped.

Bioluminescence is the name scientists give to the ability of living creatures to use body chemistry to produce and emit light. There are two critical purposes behind the firefly light show. Fireflies (actually beetles in one of several genera) use their tail lights, or lanterns, to attract mates and to lure prey. Flashing in their society isn't only encouraged, but necessary for survival.

Males and females identify each other by the timing of their flashes. The pattern of the flash differs for each species, allowing members of that species to recognize each other. However, the females of the genus Photurus have evolved the ability to imitate the flash patterns of female Photinus (another genus of firefly), to attract Photinus males, whereupon she attacks and eats them. Because of this deceptive ability, Photurus females are often described as the femme fatales of the firefly domain.

By consuming a male Photinus, the female Photurus firefly gains both the nutrition from her prey's body and certain compounds (lucibufagins) it contains, which make her unappealing to certain predators such as the Phidippus jumping spider.

With such great survival mechanisms, you’d think that lightning bugs would outlast us all, but I’ve noticed fewer and fewer lightning bugs in my yard over the years. Scientists are concerned about this, too, and their research reveals light pollution as one reason behind their disappearance.

It seems that the artificial light we produce outside our homes at night confuses the fireflies and shuts them down. When they can’t tell day from night they tend to keep their lanterns off. When they stop flashing, the beetles aren’t attracting mates or their much-needed food sources.

Sadly, scientists predict that in certain parts of the country, lightning bugs may be gone in as little as a decade. One simple solution is to cut down on light pollution-but urban sprawl shows no signs of reversing itself.

Still, if you’re fortunate enough to live away from urban bright lights, try turning off your own outdoor lights. You’ll save money and reduce your carbon footprint. Then, when the weather turns warm, turn off your indoor lights, too, take a seat by the window and be patient. With luck, you’ll be rewarded with a beautiful light show that may transport you back.

By Susan Ferber, Master Gardener