Answer: firefly

AnswerCrossword Clue
FIREFLYLuminescent critter
FIREFLYInsect you can see in the dark
FIREFLYLightning bug
FIREFLYOperetta by Friml.
FIREFLYLightning bug.
FIREFLYFriml operetta
FIREFLYNight light?
FIREFLYBioluminescent beetle
fireflya luminous insect
fireflyA soft-bodied beetle related to the glowworm, the winged male and flightless female of which both have luminescent organs. The light is chiefly produced as a signal between the sexes, esp. in flashes