I've been watching fireflies on my street for decades, and I have seen no decline - they show up at the same time of year, in the same numbers. I was worried a

I've been watching fireflies on my street for decades, and I have seen no decline - they show up at the same time of year, in the same numbers. I was worried about what street lighting was doing to them (since I mainly saw them on the street), until one day I happened to be walking in a backyard with some huge trees, and saw more fireflies in those trees than I've ever seen before. The trees were in a dark backyard and the fireflies seemed to be doing extremely well - the trees were just full of them. And since fireflies eat sap from tree roots, I think human lighting activities don't really harm them too much. My takeway: If you want to see how fireflies are doing, don't just walk down the street and look, make a point of looking in backyards, and unbuilt areas. Suburbs and rural areas probably host large numbers of them. (But urban areas probably have few if any.)