A skull of a very large crane from the late Miocene of Southern Germany, with notes on the phylogenetic interrelationships of extant Gruinae Gerald MayrThomas LechnerMadelaine Böhme Original Article Open access 14 July 2020 Pages: 923 - 933
Natal dispersal in Black Kites Milvus migrans migrans in Europe Simona OvčiarikováJan ŠkrábalIvan Literák Original Article 30 April 2020 Pages: 935 - 951
Western Marsh Harriers Circus aeruginosus from nearby breeding areas migrate along comparable loops, but on contrasting schedules in the West African–Eurasian flyway Wouter M. G. VansteelantRaymond KlaassenAnny Anselin Original Article Open access 16 May 2020 Pages: 953 - 965
Ravens respond to unfamiliar corvid alarm calls Marika DavídkováPetr VeselýThomas Bugnyar Original Article 02 May 2020 Pages: 967 - 975
Son or daughter, it does not matter: brood parasites do not adjust offspring sex based on their own or host quality Radka ValterováPetr ProcházkaMarcel Honza Original Article 03 May 2020 Pages: 977 - 986
Rejection of parasitic eggs by Yellow-bellied Prinias: importance of egg spot location Longwu WangYu-Cheng HsuWei Liang Original Article 28 May 2020 Pages: 987 - 994
Avian haemosporidian prevalence and its relationship to host traits in Western Tennessee Maria PopescuMitch R. TrychtaMichael D. Collins Original Article 01 May 2020 Pages: 995 - 1010
Effect of introduced parasites on the survival and microbiota of nestling cactus finches (Geospiza scandens) in the Galápagos Islands Alyssa M. AddessoJohanna A. HarveySarah A. Knutie Original Article 06 July 2020 Pages: 1011 - 1019
A near-infrared spectroscopy (NIRS) device unveils oxygenation levels in skeletal muscle and brain of a conscious Harris’s Hawk (Parabuteo unicinctus) Kimiaki DoiKeisuke HiwatashiRisuke Mizuno Original Article Open access 02 May 2020 Pages: 1021 - 1024
Yolk immunoreactive corticosterone does not relate with maternal fecal glucocorticoids in a captive population of Greater Rheas (Rhea americana) Natalia S. Della CostaJoaquin L. NavarroMónica B. Martella Original Article 22 June 2020 Pages: 1025 - 1032
Extensive use of the high seas by Vulnerable Fiordland Penguins across non-breeding stages Jean-Baptiste ThiebotCharles-André BostSusan M. Waugh Original Article 30 May 2020 Pages: 1033 - 1043
Feather stable isotope (δ2H) measurements suggest no historical variation in latitudinal origin of migrants in two declining songbirds Frédéric JiguetKevin J. KardynalKeith A. Hobson Original Article 23 June 2020 Pages: 1045 - 1050
Morphological differences between ‘Mangrove White-eye’ and montane Abyssinian White-eye (Zosterops abyssinicus arabs) in Arabia despite no differentiation in mitochondrial DNA: incipient speciation via niche divergence? Jem BabbingtonChristopher R. J. BolandManuel Schweizer Original Article 24 May 2020 Pages: 1051 - 1060
Taxonomic revision of the Long-tailed Rosefinch Carpodacus sibiricus complex Simin LiuChentao WeiYang Liu Original Article 15 July 2020 Pages: 1061 - 1070
Plumage coloration and morphometrics of the Little Owl Athene noctua in the Western Palearctic Irene PellegrinoMarco CuccoMarco Pavia Original Article 01 June 2020 Pages: 1071 - 1081
On the importance of niche packing for local species richness in taxonomic bird groups of the Neotropical region Luiz dos AnjosBia A. de Almeida Original Article 15 June 2020 Pages: 1083 - 1092
Seasonally persistent foraging niche segregation between sympatric Southern Rockhopper and Magellanic penguins breeding at Isla de los Estados, Argentina Natalia G. RoscianoMichael J. PolitoAndrea Raya Rey Original Article 15 July 2020 Pages: 1093 - 1104
Does foraging competition drive plumage convergence in three look-alike Atlantic Forest woodpecker species? Juan Manuel FernándezJuan Ignacio AretaMartjan Lammertink Original Article 23 July 2020 Pages: 1105 - 1116
Quantifying bird diversity at three sites of differing herbivore presence Roxane J. FrancisKate J. BrandisCorey T. Callaghan Original Article 24 July 2020 Pages: 1117 - 1127
Monitoring the annual vocal activity of two enigmatic nocturnal Neotropical birds: the Common Potoo (Nyctibius griseus) and the Great Potoo (Nyctibius grandis) Cristian Pérez-GranadosKarl-L. Schuchmann Original Article 25 June 2020 Pages: 1129 - 1141
Nocturnal singing by diurnal birds in a temperate region of central Europe Kinga KułagaMichał Budka Original Article Open access 23 June 2020 Pages: 1143 - 1152
Parental defence in shorebirds is mediated by embryonic calling, ambient temperature and predator latency Kristal N. KostoglouWouter F. D. van DongenMichael A. Weston Original Article 19 May 2020 Pages: 1153 - 1165
The impact of tag position and mass on motor behavior in pigeons Xinmao TianZhiwei GongZhenlong Wang Original Article 03 July 2020 Pages: 1167 - 1174
Breeding productivity, nest-site selection and conservation needs of the endemic Turkestan Ground-jay Podoces panderi Robert J. BurnsideAlex L. BrightenAnna Ten Original Article Open access 01 June 2020 Pages: 1175 - 1183
Age-related differences in reproductive success support the selection hypothesis in a Mute Swan population Radosław WłodarczykPiotr Minias Original Article Open access 23 July 2020 Pages: 1185 - 1193