UPDATE: I took down the fireflies today to send home. But before putting them in the mailboxes, I attached a mini flashlight from Oriental Trading. I used a glue dot and stuck it on the back.
Fun Fact: Male fireflies fly in the air when flashing (their way of communicating to find a mate) and females stay in bushes and grass. Each species has its own specific flashing pattern. The male seems to say, "Hey, don't you think I'm cute?" And the female will say, "Sure, come down for a date!" However, some species of female fireflies will play a nasty trick on the males. They will flash a signal so a male comes down and then eat him up!