Ernst Mayr – ‘Darwin of the 20th century’ Jürgen HafferFranz Bairlein Editorial 15 June 2004 Pages: 161 - 162
The distribution of the serin (Serinus serinus L., 1766) in the 16th century Ragnar K. Kinzelbach Original Article 19 June 2004 Pages: 177 - 187
The phylogenetic relationships of the early Tertiary Primoscenidae and Sylphornithidae and the sister taxon of crown group piciform birds Gerald Mayr Original Article 28 January 2004 Pages: 188 - 198
Avian mitochondrial DNA sequence divergence across a headwater stream of the Rio Tapajós, a major Amazonian river John M. BatesJürgen HafferElizabeth Grismer Original Article 15 June 2004 Pages: 199 - 205
Radiation and species limits in the Asian Pallas’s warbler complex (Phylloscopus proregulus s.l.)* Jochen MartensDieter Thomas TietzeMichael Veith Original Article 17 June 2004 Pages: 206 - 222
Affinities of Carpospiza brachydactyla (Passeriformes; Passeridae) Walter J. Bock Original Article 02 June 2004 Pages: 223 - 226
On ornamental maturation of two Philippine hornbill species with a note on physiological colour change Eberhard Curio Original Article 15 June 2004 Pages: 227 - 237
Ecological constraints on the evolution of avian brains Hans WinklerBernd LeislerGustav Bernroider Original Article 15 June 2004 Pages: 238 - 244
Morphological convergence in conifer-dwelling passerines Fränzi Korner-NievergeltB. Leisler Original Article 13 March 2004 Pages: 245 - 255
Nestling characteristics and identification of the lesser spotted eagle Aquila pomarina, greater spotted eagle A. clanga, and their hybrids Ülo VäliAsko Lõhmus Original Article 08 April 2004 Pages: 256 - 263
Should avian egg size increase as a result of global warming? A case study using the red-backed shrike (Lanius collurio) P. TryjanowskiT. H. SparksS. Kuźniak Original Article 26 May 2004 Pages: 264 - 268
The third museum specimen of Stresemann’s bristlefront (Merulaxis stresemanni Sick, 1960) D. Stefan Peters Short Note 31 March 2004 Pages: 269 - 270
Aerial “flycatching”: non-predatory birds can catch small birds in flight Peter Berthold Short Note 08 June 2004 Pages: 271 - 272