“Teaming With Insects: Entomology for Grades 3-12” is written for youth who enjoy learning about and studying science and nature. Insects have been around for millions of years and have evolved and adapted to many different habitats. Adaptations involving their anatomy, physiology and behavior are what make insects so diverse and interesting. More than 1 million species of insects are known to scientists, and there may be up to 40 million more yet to be discovered. Most people consider insects pests, and some insects do damage homes, plants, crops and stored foods. Others harm humans and animals by biting, stinging and spreading diseases. The vast majority of insects, however, are beneficial to our ecosystem, and a few, such as honeybees and silkworms, provide direct economic benefits to humans.