We
all know that bugs come in different shapes and sizes; some fly, some crawl,
some wiggle—but what makes an insect, an insect?

Well, insects are arthropods (this word is from ancient Greek, meaning, “jointed foot”) with:
- 6 jointed legs
- 2 antennae
- Bodies divided into 3 parts (head, thorax, and abdomen)
- Compound eyes (eyes with several thousand lens)
- 1 or 2 pairs of wings
- Mouthparts (different varieties allow bugs to eat in a variety of ways: chewing, piercing-sucking, sponging, siphoning, and cutting)
- Spiracles: the insects breathing system; air enters through these holes in the abdomen, and then travels on to the tracheae
-
Exoskeletons