Discusses what paleontologists have learned from the teeth of Carcharocles megalodon, a giant prehistoric shark.

Everyone is familiar with the dodo and the wooly mammoth, but how many people have heard of the scimitar cat and the Falkland Island fox? Extinct Animals portrays over 60 remarkable animals that have been lost forever during the relatively recent geological past. Each entry provides a concise discussion of the history of the animal—how and where it lived, and how it became extinct—as well as the scientific discovery and analysis of the creature. In addition, this work examines what led to extinction—from the role of cyclical swings in the Earth's climate to the spread of humans and their activities. Many scientists believe that we are in the middle of a mass extinction right now, caused by the human undermining of the earth's complex systems that support life. Understanding what caused the extinction of animals in the past may help us understand and prevent the extinction of species in the future. Extinct Animals examines the biology and history of some of the most interesting creatures that have ever lived, including: The American Terror Bird, which probably became extinct over 1 million years ago, who were massive predators, some of which were almost 10 feet tall; the Rocky Mountain Locust, last seen in 1902, formed the most immense animal aggregations ever known, with swarms estimated to include over 10 trillion insects; the Giant Ground Sloth, which was as large as an elephant; and the Neandertals, the first Europeans, which co-existed with prehistoric Homo sapiens. Extinct Animals includes illustrations—many created for the work—that help the reader visualize the extinct creature, and each entry concludes with a list of resources for those who wish to do further research.

Now available in paperback, the first comprehensive reference on Great White sharks separates fact from fiction and presents real evidence of the ecology and behavior of these remarkable animals. The volume begins with the evolution of the white shark and its relatives and continues with sections on its anatomy, behavior, ecology, distribution, population dynamics, and interactions with humans. Included in the volume are many illustrations, maps, diagrams, graphs and photos. Covers all biological aspects of Great White sharks Includes contributions from an international team of leading authorities Heavily illustrated with maps, diagrams, graphs, and photos

Do sharks lay eggs or give birth to live young? Do sharks sleep? How long do they live? How likely are shark attacks? This book answers your questions about some of nature’s most misunderstood animals. Answering every conceivable question about sharks, authors Gene Helfman and George H. Burgess describe the fascinating biology, behavior, diversity (there are more than 1,000 species worldwide), and cultural importance of sharks, their close relationship to skates and rays, and their critical role in healthy ecosystems. Helfman and Burgess take readers on a round-the-world tour of shark habitats, which include oceans as well as lakes and even rivers (as far up the Mississippi as St. Louis). They describe huge, ferocious predators like (Great) White and Tiger sharks and species such as Basking and Whale sharks that feed on microscopic prey yet can grow to lengths of more than 40 feet. The mysterious and powerful Greenland shark, the authors explain, reaches a weight of 2,200 pounds on a diet of seal flesh. Small (less than 2-foot long) Cookiecutter sharks attack other sharks and even take a chunk out of the occasional swimmer. Despite our natural fascination with sharks, we have become their worst enemy. Many shark species are in serious decline and a number are threatened with extinction as a result of overfishing and persecution. Sharks: The Animal Answer Guide presents a perfect mix of current science, history, anthropology, intriguing facts, and gripping photographs. Whether your fascination with sharks stems from fear or curiosity, your knowledge of these animals will improve immensely when you consult this book.

Presents an illustrated look at dinosaurs, as well as prehistoric life forms that preceded them, life forms that arose after their demise, and the fossils that allow us to know about them.

Dinosaurs: A Visual Encyclopedia is a complete encyclopedia of prehistoric animal life for younger readers. It's jam-packed with over 100 dinosaurs and entries on all the best known prehistoric animals from giant dragonflies to the Velociraptor. This definitive guide includes exclusive, newly-commissioned photos of the world's best and most complete dinosaur fossils, on location in North America and Europe. Supports Common Core State Standards.