Two excellent books that cover the issue of the origins of bird flight are: Dingus, Lowell & Rowe, Timothy. (1998). The Mistaken Extinction ~ dinosaur Evolution and the Origin of birds. New York: W. H. Freeman and Company. Shipman, Pat. (1998). Taking Wing ~ Archaeopteryx and The Evolution of bird Flight. New York: Simon & Schuster. ~Brandon Haist