Insects are classified as animals. Organisms on Earth fall into one of two categories: plants or animals. The animal kingdom is quite diverse and includes arthropods, which is a family comprised primarily of insects.
Insects are abundant and live virtually everywhere on Earth. The insect class is one of the most diverse group of animals on the planet and contains over half of all identified species of animals. Insects also form the bulk of the family of arthropods (around 90 percent) and have unique physical characteristics, which include a small size, wings and the ability to undergo metamorphosis, which distinguish them from other animal species.