Great reference book for nature enthusiasts and artists. I use it for identification purposes and to get ideas for b-fly shapes and patterns. It's also just fun to flip through. As you look at the pictures, you get a feel for related groups of b-flies, so when you are out in the field, you may realize you're looking at a crescentspot or a checkerspot without knowing exactly which one. Host and nectar sources are also listed. The nectar sources help with ID.