Insects are the most diverse group of animals on our planet and represent over 90% of life forms on Earth. Insects range in size from as small as a pencil tip to as large as 6 inches in size. Almost all insects are born from eggs laid by female insects. Adult insects usually have 3 pairs of legs and 3 body sections called head, thorax and abdomen. Ants, butterflies, beetles and bees are one of the most common insects.