How do the smallest animals survive? What roles do they play in their ecosystems? The World's Smallest Animals introduces readers to the tiniest creatures on Earth. Each book highlights a different animal class and explains the importance of its smallest creatures. Vibrant, full-color photos complement the text to show these tiny animals in their habitats. Each title has a Take a Look! infographic that gives more detail about these animals, and each book also includes fact boxes with size statistics for the animals, sidebars, a glossary, a table of contents, an index, an activity, and a chart comparing the sizes of all animals noted in the book.