Examples from literature

• Fireflies and glowworms make light to protect themselves. 
• Glowworms make light to scare other animals, and some fireflies make light to show they aren’t good to eat. 
• And in the trees there were owls, and in the bushes there were whip-poor-wills, and sometimes a mockingbird, but no other kinds of birds, and at night the fireflies were all about. 
• If man could emit light in relative proportion to his size as compared with the firefly, he would need no other torch in the coal-mine. 
• Outside innumerable fireflies studded the night with gold. 
• The fireflies of the West Indies emit a continuous glow of considerable luminous intensity and the natives have used these imprisoned insects as light-sources. 
• The wind was blowing, and there were fireflies, and the dogs were jumping up and down.