The word bug can be used to describe any creepy crawler, but 'true bugs' are a specific species.
Insects make up the largest group of animals in the world.
More than 900,000 species have been identified and it is likely that many more will be discovered. Insects have been classified into 25 groups. The beetle order alone includes 250,000 species. Here are some common insect types which will help you classify a variety of creepy crawlers. They are known as Lepidoptera, from the Greek words for scale and wing, because their wings are covered with thousands of overlapping scales.