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river spanning 7 countries provides an estimate of the abundance of the two species, and essential information on the most serious threats they face, the current state of their habitats and potential conservation strategies. Communications director for WWF Colombia Julio Mario Fernández said one early conclusion scientists could draw was that river dolphins in the Amazon were doing better than those in the Orinoco. "This is the first phase of a wider programme to preserve freshwater cetaceans in these areas," he added. Fresh water dolphins are among the most threatened aquatic mammals in the world. The situation is most dire in Asia, where the Yangtze river dolphin is probably extinct and the Indus river dolphin faces a high risk of becoming extinct. Fernández said it was essential to act now before South America's dolphins go the same way. The pink river dolphin, or boto, is already classified as vulnerable by the IUCN's Red List of Threatened Species
"books", called the Folio Whale (largest), Octavo Whale, and the Duodecimo Whale (smaller), represented respectively by the sperm whale, the orca (which he calls the grampus), and the porpoise. Each such book is then divided into "chapters" representing a separate species. By the current taxonomy of Cetacea, Melville's classification is inaccurate and incomplete as well, presenting only a fraction of the nearly ninety species of Cetaceans known today. In the case of some species, in particular the blue whale (which Melville calls the "sulphurbottom whale") very little was known at the time. The classification is thus heavily weighted toward whales hunted for oil and other uses, and presents a picture of the common knowledge of whales at the time of the novel. Since Melville presents the study within a fictional context, voiced by a fictional character in the
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