The first six-page section of this book compares giant Gippsland earthworms with red wiggler worms. The Gippsland earthworm can grow to be ten feet long while red wigglers are two to four inches in length. Full-color photographs with informative captions show the sizes and habitats of these creatures. Inset boxes provide Fast Facts, such as, "Red wiggler worms are used to help make compost." The next two sections follow the same format. The Amazonian giant centipede is compared to the Hoffman's dwarf centipede. Giant centipedes which live in South America are over a foot long while dwarf centipedes, found only in Central Park in New York, are less than half an inch in length. Next, the Goliath bird-eater spider is contrasted with the Samoan moss spider. Goliath spiders found in South America have a twelve-inch leg span. The moss spider is so small it can only be seen with a microscope. The book begins with a table of contents and a short glossary. It closes with a page about an extinct sea scorpion, a bibliography, a list of internet addresses, and an index. An appropriate introductory information book for young children. Part of the "Biggest vs. Smallest Animals" series. Reviewer: Phyllis Kennemer, Ph.D.