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Lightning bugs are really cool! Where I live, people are usually surprised to find out that there are dozens of species native to the region.
A few years ago, I went on a trip to a different part of the US and they had a species of lightning bug where they all flash synchronously. Instead of flying around the yard, blinking seemingly at random like all the lightning bugs I'd ever seen up to that point, the synchronous ones crawled around in the bushes and trees and then when they flashed, they all flashed at the same time. It was super cool to see.
Another thing I've noticed about adult lightning bugs is that the populations can vary greatly from year to year around here. We might have a year or two with large numbers of them each night during the warmest parts of the year, then a year where they are few and far between.
They're also a water quality indicator.
Funny, so is your mom