Foreword Preface Pleistocene Birds A New Teratorn(Aves:Teratornithidae)from the Upper Pleistocene of Oregon,USA,by Kenneth E.Campbell,Jr:and Alison T.Stenger An Overview of the Genus Athene in the Pleistocene of the Mediterranean Islands,with the Description of Athene trinacriae n.sp.(Aver:Strigidae),by Marco Pavia and Cècile Mourer-Chauvirè Neogene Birds Neogene Avifauna of Bulgaria,by Zlatozar N.Boev Phylogeny of the Tertiary Giant Anhingas(Pelecaniformes:Anhingidae)from South America,by Jorge I.Noriega and Herculano M.F.Alvarenga Additional Material of Macranhinga paranensis(Aves:Pelecaniformes:Anhingidae)from the Upper Miocene Ituzaingó Formation of Entre Rios Province,Argentina,by Jorge I.Noriega Paleogene Birds A Preliminary Report on the Diversity and Stratigraphic Distribution of the Plotopteridae(Pelecaniformes)in Paleogene Rocks of Washington State,USA,by James L.Goedert and John Cornish Avian Remains from the Middle Eocene of the Geiseltal(Sachsen-Anhalt,Germany),by Gerald Mayt Revision of the Cathartidae(Aves:Ciconiiformes)from the Middle Eocene to the Upper Oligocene Phosphorites du Quercy,France,by Cècile Mourer-Chauvirè Birds Crossing the K-T Boundary New Interpretaions of the Birds from the Navesink and Hornerstown Formations,New Jersey,USA(Aves:Neornithes),by David C.Parris and Sylvia Hope Mesozoic Birds The Morphology and Systematics of Polarornis,a Cretaceous Loon(Aves:Gaviidae)from Antarctica,by Sankar Chatterjee The Significance of Early Cretaceous Bird Tracks,by Jong-Deock Lim,Larry D.Martin,Zhonghe Zhou,Kwang-Seok Baek and Seong-Young Yang New Information on the Hesperornithiform Readiation,by Larry D. Martin and Jong-Deock Lim Oviraptorosaurs Compared to Birds,by junchang Lii,Zhimming Dong,Yoichi Azuma,Rinchen Barsbold and Yukimitsu Tomida Form and Function The Evolution of Avian Cranial kincsis,by Walter J.Bock The Pclvis in Early Birds and Dinosaurs,by Virginia L.Naples,Larry D.Martin and John Simmons Feather and Flight Biology of Basal Birds and the Origin of Avian Flight,by Andrzej Elzanowski The Aerodynamically Streamilined Body Shape of Birds:Implications for the Evolution of Birds,Feathers,and Avian Flight,by Dominique G.Homberger Wing Loading in Primitive Birds,by Josè L.Sanz,J.C.Alvarez,C.Soriano,Francisco Hernández-Carrasquilla,Bernardino P.Pèrez-Moreno and J.Meseguer Species and Evolution The Evidence for the Timing of Speciation of Modern Continental Birds and the Taxonomic Ambiguity of the Quaternary Fossil Record,by John R.Stewart Avian Species Turnover and Species Longevity in the Pleistocene of the Palearctic,by Tommy Tyrberg Paleogeography and Stratigraphy Palaeogeographical Implications Concerning Early History of Chosen Groups of Birds,by Zygmunt Bochenski and Zbigniew M.Bochenski Are Confuciusornis and Archaefructus Jurassic Fossils?by Zhiwei Gu Early Cretaceous Maars,Depositional Environments and Their Relationship to the Fossil Preservation in Sihetun,Liaoning,Northeast China,by Tungsheng Liu,Jiaqi Liu and Guoqiang Chu