Download or read book On the Wing written by David E. Alexander and published by Oxford University Press, USA. This book was released on 2015 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the Wing is the first book to take a comprehensive look at the evolution of flight in all four groups of powered flyers: insects, pterosaurs, birds and bats. David Alexander describes and evaluates both traditional and modern wing-origin theories in light of new fossil and genetic evidence.