Tough, Toothy Baby Sharks

by Sandra Markle

Book Overview

Even before they're born, baby sharks have to be tough to survive. Some that grow inside their mothers compete with their womb-mates for food, space, and their very lives. Others have to escape as... This description may be from another edition of this product.

• Format: Library Binding
• Language: English
• ISBN: 0802795943
• ISBN13: 9780802795946
• Release Date: October 2007
• Publisher: Walker & Company
• Length: 31 Pages
• Weight: 0.92 lbs.
• Dimensions: 0.4" x 9.3" x 10.3"
• Age Range: 5 to 8 years
• Grade Range: Preschool to Grade 3

Customer Reviews

Oh, the Shark Bites, with Its Teeth, Dear

An excellent survey of various types of baby sharks, this book explores shark development from conception through embryonic development, birth, young pup life, and growth into maturity. Because of language level (as well as certain graphic content, it's probably most appropriate for the older elementary school student. Also, parents senstive to sex-education in school (if that's where this book is read) or even at home should be aware that this is a science book. Reproduction is described using accurate terms, presented in a dispassionate, factual manner. We learn that while most bony fish males release their sperm over hatched eggs; sharks, such as the Port Jackson shark directly contact the female shark. Describing a (somewhat unclear) photograph, Markle writes: "The male is biting the female to hold onto her. He has a stiff, grooved, tubelike extension on each of his two pelvic fins. Inserting one or the other of these, he desposits his sperm into her reproductive tract." Sharks differ in their in utero development, and the author does an excellent job explaining differences in gestational period, feeding, and wieght and size on birth. THere's are a lot of fascinating facts; for example, the Sandtiger pups hatch inside their mother, and the bigger pups begin eating both unfertilized eggs and their recently hatched, smaller siblings until only two survivors (onefor each of the shark;s two uteri) are released. Other pregnancy and birth examples are less gruesome. The high quality color photographs add a lot of interest, but they also don't always clearly display what the text is describing. A few more diagrams/drawings would have been helpful. Markle concludes with a map showing the home grounds of the various sharks she discusses, a pleaaa for shark conservation, some very interesting shark tidbits under the heading "Sharks are Cool!," and a glossary/index. This award winning author and TV/Internet science program developer has constructed a serious but entertaining book for budding marine biologists. 32 pages including credits and acknowledgments to two experts in the field.