From shrews to blue whales, placental mammals are among the most diverse and successful vertebrates on the Earth. Arising sometime near the Late Cretaceous, this broad clade of mammals contains more than 1,000 genera and approximately 4,400 extant species. Although much studied, the origin and diversification of the placentals continue to be a source of debate. Paleontologists Kenneth D. Rose and J. David Archibald have assembled the world's leading authorities to provide a comprehensive and up-to-date evolutionary history of placental mammals. Focusing on anatomical evidence, the contributors present an unbiased scientific account of the initial radiation and ordinal relationships of placental mammals, representing both the consensus and significant minority viewpoints. This book will be invaluable to paleontologists, evolutionary biologists, mammalogists, and students. Contributors: J. David Archibald, San Diego State University; Robert J. Asher, Institut fur Systematische Zoologie; Jonathan I. Bloch, University of Michigan; Douglas M. Boyer, University of Michigan; Daryl P. Domning, Howard University; Eduardo Eizirik, National Cancer Institute; Robert J. Emry, Smithsonian Institution; Jorg Erfurt, Martin-Luther-University; John J. Flynn, The Field Museum; Timothy J. Gaudin, University of Tennessee; Emmanuel Gheerbrant, Museum National d'Histoire Naturelle; Philip D. Gingerich, The University of Michigan; Patricia A. Holroyd, University of California, Berkeley; J. J. Hooker, The Natural History Museum; Leo F. Laporte, University of California, Santa Cruz; Jin Meng, American Museum of Natural History;William J. Murphy, National Cancer Institute; Jason C. Mussell, The Johns Hopkins University School of Medicine; Michael J. Novacek, American Museum of Natural History; Stephen J. O'Brien, National Cancer Institute; Kenneth D. Rose, The Johns Hopkins University School of Medicine; Guillermo W. Rougier, University of Louisville; Eric J. Sargis, Yale University; Mary T. Silcox, University of Winnipeg; Nancy B. Simmons, American Museum of Natural History; Mark S. Springer, University of California, Riverside; Gerhard Storch, Forschungsinstitut Senckenberg; Pascal Tassy, Museum National d'Histoire Naturelle; Jessica M. Theodor, Illinois State Museum; Gina D. Wesley, The University of Chicago; John R. Wible, Carnegie Museum of Natural History; Andre Wyss, University of California, Santa Barbara.