What is the Red List? Should wolves be re-introduced where people live? Can embryo implantation help threatened species? The 'Why Science Matters' series demonstrates how the science we learn at school is important in every aspect of our everyday lives. Using case studies and investigations, the series describes the development of science and technologies that can improve our lives or lead to new scientific challenges and controversies. In 'Protecting Threatened Species', we find out how a significant proportion of the world's wildlife is under threat and about the efforts being made to preserve habitats and species. We learn how scientists monitor and analyze threatened populations, how they manage conservation programs, and we look at the range of technologies available in the fight to prevent species becoming extinct.