Hoofed mammals include many families of large, well-known animals. In the second volume of HMW they are revealed in all their fascinating detail, in riveting accounts written by some of the most renowned authorities in the world. The species accounts supply complete and up-to-date information at a time when new and increasingly sophisticated methods of DNA analysis are reshaping our knowledge of these species; to give just one example, the family Bovidae has almost doubled its size in the last five years, to the 279 distinct species known today.