The knowledge of citizen scientists, biologists, and naturalists informs coverage of every aspect of the monach butterfly's life cycle (breeding, migration and overwintering) from the perspective of every established monarch population (Western North America, Eastern North American and Australian). It also reports on 2 major events of longterm 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. The book contains a unique combination of basic research, background information, and conservation applications.