If you think today"s sharks are fearsome, wait until you see what swam in the oceans hundreds of millions of years ago! Creatures with snouts like saws, and spiral jaws. Sharks so large they could swallow whales whole. Timothy Bradley"s vibrant illustrations and razor-sharp prose bring theseferocious fishand their tamer relativesto life with scientific detail. Learn how they survived catastrophic events that completely wiped other creatures out, and see which of their strange adaptations can still be seen in sharks today.