05/27/2026
How cool is this?
The fireflies over your lawn right now aren't one species. They're probably three — each speaking a different language.
Every species has its own flash pattern. Males fly and flash. Females sit in the grass and only respond to the correct code. Wrong pattern, no answer.
The common one swoops in a J-shaped arc with a single slow pulse at the bottom. Another flashes twice in quick succession — a doublet — then pauses. A third, active later at night, is a predator. She mimics the flash code of the other species to lure males close enough to catch.
Three species. Three languages. One of them is lying.
The flash isn't decoration. It's a conversation you can learn to read.
