Insects are defined as creatures having three body parts: a thorax, an abdomen, and a head. “Insect” specifically applies to six-legged organisms, although many people tend to call all sorts of “bugs” an insect.
A spider is not considered an insect. While some insects are capable of walking on water, most do not. Many are winged, and some even live in well-organized social colonies, such as bees, termites, and ants.
It is believed that there are between six and ten million insect species in the world. These insect identification guides break down the kinds of insects into a variety of categories and includes pictures to help with the identification process and pest control