Updated and reviewed by experts in the field for the most accurate, up-to-date information, this reference book features 2,500 species, 1,000 photos, and more than a dozen maps. Includes fun facts such as the world's tallest animal, the longest living animal on Earth, and even the smelliest--it also contains new, "From the Field" reports highlighting National Geographic explorers working around the world to study and protect every kind of animal, from giraffes to penguins and sharks to snails. Kids will dive into topics like animal homes and habitats, migration, life cycles and babies, conservation and more! Also includes an extensive listing of animal species with basic facts and figures, and a comprehensive glossary and index.