Cicada is a bug and bug is an insect. What does it mean to be a bug? We'll look more closely into insect's world to answer this questions. Insects comprise the most diverse group of animals on earth, with over 800,000 species described—more than all other animals groups combined.

Insects may be found in nearly all environments on the planet, although only a small number of species have adapted to any kind of life in the oceans. There are approximately 5,000 dragonfly species, 20,000 grasshopper, 170,000 butterfly, 120,000 fly, 82,000 true bug, 350,000 beetle, and 110,000 bee and ant species.

As you can see there is a huge variety of bugs/insects and our cicada is one out of almost a million species. It was able to survive unlike many other insects that perish with time. Moreover cicada was able adapt to ever changing habitat and now lives in the forests as well as big cities.