This volume brings together faunal analysts working at many sites spanning the East African Pliocene. Although most chapters focus on the vertebrate fauna of particular localities, authors take a broad approach that seeks to compare paleoenvironmental and paleoecological patterns across localities and among various taxonomic groups. This volume aims to synthesize large amounts of faunal data, and to present the evolution of East African vertebrates in the context of environmental and climatic changes during the Pliocene.