Naturalist E.O. Wilson once said that insects are “the little things that run the world.” Two-thirds of the world’s known animals are insects. There are more than one million species, representing 80 percent of all animal life, and it’s suspected that another four to five million are yet to be discovered. Insects spend most of their lives industriously providing food for all other animals on earth, including humans. Click on a group to learn more about the fabulous insects that live in your yard.