Long ago there lived big cats whose giant teeth make today’s cats look tame: sabertooth! Those teeth helped it compete with other predators for a meal of mammoth—or even a tasty human. Then, ten thousand years ago, every last sabertooth disappeared. With only ancient bones—and massive teeth—to guide them, scientists are learning amazing facts about these enormous prehistoric cats. Patrick O’Brien’s captivating illustrations, exciting facts, and kidfriendly, comics-inspired design will thrill young adventurers.