The definitive scientific and historical guide to the many species of undead, Zombies of the World reveals zombies to be a part of our ecosystem and the key to new discoveries in medicine and technology. After decades of research, we have no idea why zombies never tire or stop. They possess an endless source of energy to shamble or (in some cases) sprint after us. Unlocking this mystery could benefit all of humanity. This Field Guide describes 20 prominent zombie species with scientific names, habits, and range; 60 full-color illustrations of zombies, historical documents, and the undead in action; "Project Resurrectionist", the U.S. government's secret zombie research program; theories of zombie evolution and migration; cutting-edge technology to harness clean renewable energy from the undead; and much, much more.