lightning bugs vs. fireflies
lady bugs vs. lady birds ....what do you say???
some questions about lightning bugs answered here:
Q: why don't fireflies live in the western US???
A: because it's too dry... lightning bugs like moisture, humidity, lakes and rain.
Q: i've noticed fewer and fewer fireflies every summer, why???
A: you can thank urban sprawl and chemicals/pesticides. :( basically, we are the only ones to blame.
Q: how do lightning bugs light up???
A: it's complicated.
why some people call lady bugs "lady birds" (and vice versa):
Ladybird is a name that has been used in England for more than 600 years for the European beetle Coccinella septempunctata. As knowledge about insects increased, the name became extended to all its relatives, members of the beetle family Coccinellidae. Of course these insects are not birds, but butterflies are not flies, nor are dragonflies, stoneflies, mayflies, and fireflies, which all are true common names in folklore, not invented names. The lady for whom they were named was "the Virgin Mary", and common names in other European languages have the same association (the German name Marienkafer translates to "Marybeetle" or ladybeetle).
source and more info found here.