Did you know that a Sperm Whale has the largest brain of any living creature? Would you believe that whales, dolphins and porpoises may have evolved from a small, dog-like animal with a coat of hair? What are the differences between a dolphin and a porpoise? Find out now! With fabulous illustrations and fascinating facts, Doug Priestly takes readers on an irresistible journey through the oceans of Australia and New Zealand. Take the plunge and enter the incredible world of whales, dolphins and porpoises.