Island biogeography is the study of the distribution and dynamics of species in island environments. Due to their isolation from more widespread continental species, islands are ideal places for unique species to evolve, but they are also places of concentrated extinction. Consequently, they are widely studied by ecologists, evolutionary biologists, and conservationists. This accessible textbook builds on the success and reputation of its predecessors, documenting the recent advances in this exciting field and explaining how islands have contributed to both theory development and testing. In addition, the book describes the main processes of island formation, subsequent dynamics, and eventual demise, explaining the relevance of island environmental history to island biogeography. The authors demonstrate the significance of islands as hotspots of biodiversity and of prehistoric and historic anthropogenic extinction. Since island species continue to feature disproportionally in the lists of threatened species today, the book examines both the chief threats to their persistence and some of the mitigation measures that can be put in play, with conservation strategies specifically tailored to islands.