HAVE YOU EVER WONDERED what it would be like to live in prehistoric times alongside massive dangerous creatures like Megalodon, Mosasaurus, or Tyrannosaurus rex? Wonder no more! 

Award-winning author-historian Lochlainn Seabrook's unique book,When Monsters Ruled, takes you on a detailed tour inside the mysterious and often terrifying realm of, as his subtitle states: "The 25 Scariest Animals of the Prehistoric World."

Among his awesome beasts are Andrewsarchus, Arctodus, Argentavis, Arthropleura, Basilosaurus, Brygmophyseter, Cameroceras, Carbonemys, Deinosuchus, Dunkleosteus, Entelodon, Gigantopithecus, Gorgonopsid, Helicoprion, Kaprosuchus, Kronosaurus, Livyatan, Mauisaurus, Megalodon, Mosasaurus, Quetzalcoatlus, Smilodon, Spinosaurus, Titanoboa, and of course, Tyrannosaurus. 

Each entry provides five or more color illustrations depicting the animal's body, head, skeleton, size comparison to man, and feeding and hunting behaviors. Mr. Seabrook devotes a full page to quick facts concerning each species full scientific name, nickname, height, weight, length, lifespan, speed, reasons for becoming extinct, and much more. 

A second page is dedicated to a fascinating in-depth discussion on each animal's ecology and life history. Along with over 150 eye-popping, one-of-a-kind, color illustrations the author provides an introduction, a helpful index, and a comprehensive bibliography. 

In addition he also includes a special bonus section with ten additional frightening prehistoric megafauna, such as the American lion, Megalania, and Thalattoarchon.

When Monsters Ruled is a must-own for all those interested in paleontology, dinosaurs, prehistoric creatures, natural history, biology, evolution, and animals and science in general.