A fascinating account of the biology of the world's auks (or alcids). Full of valuable nuggets of information, much coming from years of field research by the authors. The text is rich in useful maps, line drawings and tables of facts and figures. The color plates by Ian Lewington are up to his usual very high standard and show all living species in the majority of plumage states. I found the discussion of the evolution and radiation of both extant and extinct species particularly interesting. The high price and limited treatment of field identification may put off many birdwatchers, however those who read the book will be surprised at how interesting the auks really are.