The knowledge of citizen scientists, biologists, and naturalists informs this book's coverage of every aspect of the monarch butterfly's life cycle (breeding, migration, and overwintering) from the perspective of every established monarch population (western North American, eastern North American, and Australian). In addition to presenting the most recent basic research on this species, The Monarch Butterfly contains the first publication of data compiled from two established citizen science projects, Journey North and the Monarch Larva Monitoring Project. It also reports for the first time on two major events of long-term importance to monarch conservation and biology: the creation of a larger protected area in the Mexican overwintering sites and a weather-related mortality event during the winter of 2002.Monarch butterflies are arguably the most recognized, studied, and loved of all insects, and the attention that scientists and the general public have paid to this species has increased both our understanding of the natural world and our concern about preserving it. The unique combination of basic research, background information, and conservation applications makes this book a valuable resource for ecologists, entomologists, naturalists, and teachers.