For roughly three weeks between late May and mid-June, the forests around Rajmachi pulse with light. Entire trees flash in synchrony — on, off, on — like the forest has a heartbeat. It's a courtship display, and it's one of the most extraordinary natural events in India.
The science of the glow
Male fireflies produce cold light through a chemical reaction — luciferin meeting oxygen — to signal females waiting in the undergrowth. Each species has its own flash pattern. Just before the monsoon breaks, humidity peaks and so does the display.
How to watch without wrecking it
- No torches or phone flashlights on the trail — light pollution disrupts mating
- No flash photography, ever
- Stay on the trail; eggs are laid in the undergrowth
- Keep voices low — you'll hear the forest better too
“The first gasp when a whole tree lights up — that sound is why I lead this trail every single season.”
