- Maps, charts, and graphs created expressly for Watts Libraryô
- Sidebars highlighting fast facts, quick biographies, and other extracted information
- Timeline (in all social studies titles)
- "To Find Out More" (books, organizations, websites, films/videos, audio)
- "A Note on Sources" (a note from the author describing his or her research materials and processes)
2/1/02 School Library Journal
"While many books exist about the various animals mentioned, these succinct titles will not hibernate on the shelves for long."