A richly illustrated introduction to the spectacular reptiles that swam the oceans when dinosaurs roamed the land During the Mesozoic Era, 252 to 66 million years ago, dinosaurs ruled the land, but the ocean deeps were roiling with equally spectacular reptiles—including giant predators. This richly illustrated, authoritative, and accessible book introduces readers to the world of these fascinating marine animals, whose predecessors returned to the seas a few million years after the first vertebrates emerged from the water. As we meet ichthyosaurs, plesiosaurs, mosasaurs, and many others, we learn about the astonishing anatomical, physiological, and behavioral adaptations that enabled these reptiles to become ocean dwellers again. We also learn about their living descendants, including sea turtles and sea snakes. Featuring stunning artwork depicting these prehistoric ocean creatures and photographs of their fossil remains, this book invites readers to discover the enthralling past of marine reptiles in all their extraordinary diversity.

Driving across the North American Heartland, surrounded by prairie, it is almost impossible to imagine that once this was once a huge inland sea. The Western Interior Seaway, which split the entire continent of North America in half, once teemed with predatory creatures - fanged fish and turtles the size of small cars; prowling sharks and giant squid; hungry plesiosaurs and immense crocodiles. At the top of this prehistoric food chain, stretching up to nearly 15 metres (50 feet) and weighing a hefty 50,000 kilograms (50 tonnes), ruled the mighty mosasaur, the T-Rex of the sea. Through a cooperative partnership with the Canadian Fossil Discovery Centre (CFDC), home to 'Bruce', the world's largest mosasaur skeleton, author Larry Verstraete and illustrator Julius Csotonyi combine fascinating facts, astonishing discoveries, and the latest paleontological information to bring the ancient marine creatures of the Seaway to vivid life.

Explores the Earth prior to dinosaurs and examines the creatures that lived here.

When Ronnie’s parents go on a business trip and leave her with Miss Lernin for the week, Ronnie is sure she’s in for a big, dinosaur-size adventure. After all, her last trip with Miss Lernin involved real-life dinosaurs! So, when they end up at the aquarium's jellyfish exhibit, Ronnie is confused. Surely jellyfish aren’t as cool as dinosaurs, right? Wrong! Determined to show Ronnie just how interesting prehistoric life was before the age of the dinosaurs, Miss Lernin takes her back in time to the six parts of the Paleozoic era to study the earliest lifeforms on Earth, and how many left the ocean for life on land.

A fun, pocket-sized book presenting the remarkable dinosaurs and other creatures that roamed Earth billions of years ago Smithsonian Dinosaurs and Other Amazing Creatures from Deep Time traces the journey of life on Earth from its origins some 4.6 billion years ago. Beginning with the first evidence of life in the form of single-celled microbes, it moves through the Cambrian era's explosion of biodiversity around 540 million years ago through the mass extinction event 252 million years ago that cleared the stage for the first turtles, pterosaurs, and other dinosaurs and mammals of the Triassic era. It offers a rare look at some of the world's most fascinating creatures: from sauropods, the largest creatures to ever walk the land, to the top carnivorous predator Tyrannosaurus rex, as well as the mastodons, saber-toothed cats, dire wolves, walrus-whales, and other beasts that seem outlandish to us now. Profiling these and many other fascinating creatures throughout prehistory, the book is sure to delight young dinosaur enthusiasts.

"Dino" Don Lessem brings readers face-to-face with various dinosaur species, detailing their habitats, way of life and how they became extinct. An acclaimed dinosaur expert, Don Lessem has written more than 30 children's books, writes a popular dinosaur column in Highlights magazine, and was an adviser for Jurassic Park. Take a trip through dinosaur time to meet these sea giants face-to-face: The Archelon was similar to a turtle, but its shell was made of crossed rib bone covered in rubbery skin! The Mososaurs had huge pointy jaws and grew to be fifty feet long! The Ichthyosaurs looked a lot like dolphins! Plus, you'll get to know Opthalmosaurus, Kronosaurus, Shonisaurus, Plesiosaurs and Teleosaurus!

An authoritative illustrated guide to the mighty reptiles that dominated the seas of the Mesozoic for 185 million years New discoveries are revealing that many ancient oceangoing reptiles were energetic animals capable of inhabiting an array of watery habitats and climates, including polar winters. The Princeton Field Guide to Mesozoic Sea Reptiles provides the most up-to-date and comprehensive coverage of the great Mesozoic groups that commanded the seas for tens of millions of years. This incredible field guide covers 435 species and features stunning illustrations of swimming reptiles ranging in size from little lizards to others with great necks longer than their bodies. It discusses the history of sea reptiles through 185 million years of the Mesozoic, their anatomy, physiology, locomotion, reproduction and growth, and extinction, and even gives a taste of what it might be like to travel back to the Mesozoic. This one-of-a-kind guide also challenges the common image of these reptiles as giants of the prehistoric waters, showing how the largest weighed far less than today’s biggest whales. Features detailed species accounts of 435 different kinds of sea reptiles, with the latest size and mass estimatesWritten and illustrated by the acclaimed researcher and artist who helped to redefine our understanding of dinosaur anatomyDescribes placodonts, plesiosaurs, ichthyosaurs, mosasaurs, sea snakes, sea turtles, marine crocs, and moreCovers everything from biology to the colorful history of sea reptile paleontologyIncludes dozens of original skeletal drawings and full-color life scenes