They talk!

The air is clear and warm. No artificial lights anywhere. The moon is lingering lazily in the trees lining the river. Some fireflies are having a good time, switching their glow on and off rather randomly - in one group they seem to synchronize but then it is random again. It reappears: a few bugs are flashing simultaneously at first, then more of them join in, and then even more until a huge cloud of insects is flashing in tune.
Are they doing this on purpose? Do they even know that they are glowing? Do they have a will to turn their light on and off?  Obviously they do communicate. But why? How do they do it? 
Or don’t they? 

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