Earth is home to all kinds of enormous animals. This series explores 10 of the world's biggest creatures, describing their life cycles, habitats, and how they survive in the wild. Each book pairs short paragraphs of easy-to-read-text with plentiful photos and includes a table of contents, fun facts, sidebars, comprehension questions, a glossary, an index, and a list of resources for further reading. Apex books have low reading levels (grades 2-3) but are designed for older students, with interest levels of grades 3-7.