This is THE identification guide for the marine mammals of the world. The species' reviews is more than usual in this kind of guides, very detailed and with current information. It is plenty of photographs and figures, almost all of them very explicit. The species list reflects the changing, and in some cases unclear, taxonomy of cetaceans. Recently described species are included (eg. snubfin dolphin, Omuras' whale). IUCN status is also included. Hardcover is a good thing, but with very thin pages inside, keep it in the vessel's bridge!.