What is the main characteristic of a lampyrid insect?

Taranchalanche, There is a cave in Tasmania called The Glowworm Cave. The ceiling is covered in them and a beautiful sight.

We once found a deceased lightning bug which was still lit up. Thought that was intriguing.

Is Heartland Old Guy still alive?? I think he might be close to my age!

I'm fascinated by fireflies they're so cool my cats love chasing them at night when they light up.

Read and learn.

Was seein lightnin bugs whilst answering the question!