[ConceptJunkie]

We called them "lightning bugs" when I was living in Pennsylvania (as I recall), but since then I've lived in North Carolina and Virginia and now think of them as "fire flies".

Maybe it's a north/south thing, too.

[js2]

I grew up in Miami and what we called lightning bugs were a beetle with a pair of green glowing dots on the head:

https://youtu.be/7MMleTEQoo4

I now live in NC where the bug is called a firefly and it has a single yellow glow near its tail and looks more like a fly.