Go back to home page: back.Adult beetles have two sets of wings. Female beetles usually lay dozens or hundreds of eggs. Most beetles only live for a year. Beetles cannot see very well, so they communicate using pheromones, sounds or vibrations. Some beetles are not considered pests. "Ladybugs" are beetles and are considered to be good luck in many cultures. "Fireflies" and "Lightning bugs" are also beetles. They glow in the dark to communicate. There are 12,000 different kinds of beetles in the United States and over 300,000 species in the world. Beetles are found on land and in fresh water and can adapt to almost any environment. Beetles usually just live where they eat. Beetles can both hurt and help the environment. Some beetle species destroy crops or property, while some species help get rid of garbage, eat dead trees or help pollinate flowers.