I am indebted to Sven Tränkner for taking the photographs, Cécile Mourer-Chauviré for discussions on the fossil birds from the Quercy fissure fillings, and Albrecht Manegold for insightful comments on parts of the manuscript. For providing photographs of fossil specimens, I thank Herculano Alvarenga, Julia Clarke, Ewan Fordyce, James Goedert, Peter Houde, Dan Ksepka, Bent Lindow, Cécile Mourer-Chauviré, Norbert Micklich, and Ilka Weidig. Access to fossil specimens was kindly provided by Walter Boles, Elvira Brahm, Sandra Chapman, Michael Daniels, Dino Frey, Norbert Hauschke, Meinolf Hellmund, Peter Houde, Norbert Micklich, Cécile Mourer-Chauviré, Wolfgang Munk, Burkhard Pohl, Stephan Schaal, Thierry Smith, and Basil Thüring. I am further obliged to Dieter Czeschlik for enabling this book project, and Anette Lindqvist and Thavamani Saravanan for their efforts in the production of this book. Above all, however, I thank my wife, Eun-Joo, for her patience and moral support during the preparatory stage of this work.
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