Moths sometimes seem like the forgotten cousins of butterflies. While butterflies may be some of the most well-known insects in the world, there are many more species of moths. In fact, there are "only" 17,500 known species of butterflies compared to almost 160,000 species of moths. Nearly 11,000 of those can be found in the United States. With moths as numerous as they are, why do they seem so mysterious? Let's explore.