This book reviews and synthesizes studies on local and regional occupancy and abundance of Neotropical mammals from central Mexico to South America. The book focuses primarily on addressing issues of a wide array of mammalian species from a population level in different habitats and ecosystems across the Neotropical region. Occupancy and abundance analyzed through hierarchical approaches with a variety of statistical tools are the central ecological parameters treated in the chapters of this volume. This book will be an updated reference for researchers, professionals, students, wildlife managers, and people interested in mammal ecology and conservation in tropical and subtropical regions.