Book Description: This Gem explores and explains the world of whales and dolphins. Over 50 species of whale, dolphin and porpoise are illustrated with the author's own photographs. Aspects covered include: evolution; identification; biology; zoological categorization; feeding habits; and predators. The book answers commonly-asked questions, such as "how intelligent are dolphins?" and "should whales be kept in captivity?", and discusses the sensitive subject of whale conservation.