Sharks in some form or other have been on this planet for more than 450 million years, and they remain one of the most fascinating of species. The clever title of this book identifies its content perfectly since it is, indeed, a history of sharks from the Devonian period to the present-day Quaternary period. The book is an oversize one, which suits its topic well, and readers will be able to refer to the timelines that appear periodically on its pages as they learn about the creatures that preceded today's modern sharks, allowing readers to compare and contrast the early sharks with modern ones. There are text boxes detailing the animals' size, habitat, what part of the world it was found in, and preferred foods. A Toolbox feature identifies some of the attributes of sharks that have allowed them to thrive while other animals died out, including their shape, their skin, their cartilage, their teeth, and their jaws as well as information about shark nurseries and how some sharks are actually quite social. There is even a discussion about how scientists study sharks and what they can learn from teeth, fossils, and even their poop. All of this is fascinating and will provide tidbits that readers will want to share with others. Even someone who has read many books about sharks will find something new in this book, which evokes a sense of wonder and respect for this long-lived species that is so often misunderstood by humans. And there are so many different types of sharks to examine: My personal favorite has always been the oddly-shaped hammerheads. This well-designed book contains impressively detailed illustrations, painted with gouache, scanned, and then organized digitally. These images fill up entire pages and three-quarters of the double-page spreads and situate the sharks in their natural habitats. Readers will find it hard to look away from the artwork since the illustrations make readers feel as though they are staring at the various sharks through a glass pane or a submersible. This one is a must-have for any science classroom studying the ocean and its inhabitants or someone looking for a book sure to lure in even the most jaded of young readers.