Giant Galapagos tortoises have roamed the Galapagos Islands for thousands of years, but these creatures almost disappeared from their tropical habitat. This book describes the world's largest tortoise, how sailors and invasive species caused its population to dwindle, and how habitat preservation and captive breeding have helped save the species. Easy-to-read text, vivid images, and helpful back matter give readers a clear look at this subject. Features include a table of contents, infographics, a glossary, additional resources, and an index. Aligned to Common Core Standards and correlated to state standards.