This book is an excellent source for our elementary students who are interested in or studying common dolphins.  The chapters include common dolphins; size, shaped and color; where they live; senses; defense; food; babies; and behaviors.  There are common dolphin facts, a glossary, index and additional web sites listed in the back of the book.  The information was presented in a clear manner with nice basic coverage of each topic.  The text was not too technical while still using some scientific language.