Now is the time for conservation science—a mission-oriented scientific enterprise that seeks to protect nature, including Earth’s animals, plants, and ecosystems, in the face of unprecedented human demands upon the planet. Conservation scientists apply principles from ecology, population genetics, economics, political science, and other natural and social sciences to manage and preserve nature. The focus of this textbook is first and foremost on protecting nature and especially Earth’s biota. It also contains a heavy emphasis on highlighting strategies to better connect the practice of conservation with the needs and priorities of a growing human population. Now used at over 150 colleges and universities, Conservation Science is an original and modern approach to conservation. Conservation Science was primarily written primarily for undergraduates and beginning graduate students who are interested either in academic careers or working in conservation at government agencies, non-governmental organizations, or international institutions.