Comprehensive and profusely illustrated exploration of all that is known about the origin of birds and of avian flight. Alan Feduccia, a leading ornithologist and evolutionary biologist, draws on fossil evidence and studies of the structure and biochemistry of living birds to present current knowledge and fresh data on avian evolution and to propose a major new model of this evolutionary process. Revised second edition witn new references and new Chapter 9. Ornithology Birds 150315