"Kids' books are not only for kids. Moms, dads, big brothers and sisters and, of course, teachers read them as well. There is something in this book for all its readers. Most important, the book is scientifically accurate. The major characteristics of reptiles are explained clearly and in a most poetic way. The words in each sentence are chosen carefully and should help parents and teachers cover important elements in developing reading and writing skills in their readers. Learning about common organisms is important in developing an interest in science among youngsters, and this book does that exceedingly well. The book would be a great addition to a home, school or public library. Hopefully readers will be excited by this book and eager to learn more...." (Science Books & Films)

"Those CATegorical felines are back. This time they turn their attention to the characteristics of mammals, reptiles, amphibians, birds, insects, and fish. The energetic rhyming text...will captivate students and make it fun to learn about what makes each group distinctive. Goneau's cartoon creatures nicely complement the facts that Cleary imparts in his rhythmic narrative.... Each volume concludes with two pages summarizing the key characteristics of the animal class under discussion. Solid additions to the series." (School Library Journal, Series Made Simple) 

"The Categorical cats are back again, ready to explore animal classification in Brian P. Cleary's new series. Brief, but interesting discussion follows, moving the reader from page to page until they are asked to recall what they have learned. An endnote indicates a website for additional activities and games. The presentation is so much fun that readers are unaware of how much they are actually learning as they study traits animals have in common and come to the understanding that they are classified because of these traits." (Library Media Connection)