1. A skull of a very large crane from the late Miocene of Southern Germany, with notes on the phylogenetic interrelationships of extant Gruinae

   • Gerald Mayr
   • Thomas Lechner
   • Madelaine Böhme

   Original Article Open access 14 July 2020 Pages: 923 - 933

   

2. Natal dispersal in Black Kites Milvus migrans migrans in Europe

   • Simona Ovčiariková
   • Jan Škrábal
   • Ivan Literák

   Original Article 30 April 2020 Pages: 935 - 951

   

3. 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. Vansteelant
   • Raymond Klaassen
   • Anny Anselin

   Original Article Open access 16 May 2020 Pages: 953 - 965

   

4. Ravens respond to unfamiliar corvid alarm calls

   • Marika Davídková
   • Petr Veselý
   • Thomas Bugnyar

   Original Article 02 May 2020 Pages: 967 - 975

   

5. Son or daughter, it does not matter: brood parasites do not adjust offspring sex based on their own or host quality

   • Radka Valterová
   • Petr Procházka
   • Marcel Honza

   Original Article 03 May 2020 Pages: 977 - 986

6. Rejection of parasitic eggs by Yellow-bellied Prinias: importance of egg spot location

   • Longwu Wang
   • Yu-Cheng Hsu
   • Wei Liang

   Original Article 28 May 2020 Pages: 987 - 994

   

7. Avian haemosporidian prevalence and its relationship to host traits in Western Tennessee

   • Maria Popescu
   • Mitch R. Trychta
   • Michael D. Collins

   Original Article 01 May 2020 Pages: 995 - 1010

   

8. Effect of introduced parasites on the survival and microbiota of nestling cactus finches (Geospiza scandens) in the Galápagos Islands

   • Alyssa M. Addesso
   • Johanna A. Harvey
   • Sarah A. Knutie

   Original Article 06 July 2020 Pages: 1011 - 1019

   

9. A near-infrared spectroscopy (NIRS) device unveils oxygenation levels in skeletal muscle and brain of a conscious Harris’s Hawk (Parabuteo unicinctus)

   • Kimiaki Doi
   • Keisuke Hiwatashi
   • Risuke Mizuno

   Original Article Open access 02 May 2020 Pages: 1021 - 1024

   

10. Yolk immunoreactive corticosterone does not relate with maternal fecal glucocorticoids in a captive population of Greater Rheas (Rhea americana)

    • Natalia S. Della Costa
    • Joaquin L. Navarro
    • Mónica B. Martella

    Original Article 22 June 2020 Pages: 1025 - 1032

    

11. Extensive use of the high seas by Vulnerable Fiordland Penguins across non-breeding stages

    • Jean-Baptiste Thiebot
    • Charles-André Bost
    • Susan M. Waugh

    Original Article 30 May 2020 Pages: 1033 - 1043

    

12. Feather stable isotope (δ²H) measurements suggest no historical variation in latitudinal origin of migrants in two declining songbirds

    • Frédéric Jiguet
    • Kevin J. Kardynal
    • Keith A. Hobson

    Original Article 23 June 2020 Pages: 1045 - 1050

    

13. 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 Babbington
    • Christopher R. J. Boland
    • Manuel Schweizer

    Original Article 24 May 2020 Pages: 1051 - 1060

    

14. Taxonomic revision of the Long-tailed Rosefinch Carpodacus sibiricus complex

    • Simin Liu
    • Chentao Wei
    • Yang Liu

    Original Article 15 July 2020 Pages: 1061 - 1070

    

15. Plumage coloration and morphometrics of the Little Owl Athene noctua in the Western Palearctic

    • Irene Pellegrino
    • Marco Cucco
    • Marco Pavia

    Original Article 01 June 2020 Pages: 1071 - 1081

    

16. On the importance of niche packing for local species richness in taxonomic bird groups of the Neotropical region

    • Luiz dos Anjos
    • Bia A. de Almeida

    Original Article 15 June 2020 Pages: 1083 - 1092

    

17. Seasonally persistent foraging niche segregation between sympatric Southern Rockhopper and Magellanic penguins breeding at Isla de los Estados, Argentina

    • Natalia G. Rosciano
    • Michael J. Polito
    • Andrea Raya Rey

    Original Article 15 July 2020 Pages: 1093 - 1104

    

18. Does foraging competition drive plumage convergence in three look-alike Atlantic Forest woodpecker species?

    • Juan Manuel Fernández
    • Juan Ignacio Areta
    • Martjan Lammertink

    Original Article 23 July 2020 Pages: 1105 - 1116

    

19. Quantifying bird diversity at three sites of differing herbivore presence

    • Roxane J. Francis
    • Kate J. Brandis
    • Corey T. Callaghan

    Original Article 24 July 2020 Pages: 1117 - 1127

    

20. Monitoring the annual vocal activity of two enigmatic nocturnal Neotropical birds: the Common Potoo (Nyctibius griseus) and the Great Potoo (Nyctibius grandis)

    • Cristian Pérez-Granados
    • Karl-L. Schuchmann

    Original Article 25 June 2020 Pages: 1129 - 1141

    

21. Nocturnal singing by diurnal birds in a temperate region of central Europe

    • Kinga Kułaga
    • Michał Budka

    Original Article Open access 23 June 2020 Pages: 1143 - 1152

    

22. Parental defence in shorebirds is mediated by embryonic calling, ambient temperature and predator latency

    • Kristal N. Kostoglou
    • Wouter F. D. van Dongen
    • Michael A. Weston

    Original Article 19 May 2020 Pages: 1153 - 1165

    

23. The impact of tag position and mass on motor behavior in pigeons

    • Xinmao Tian
    • Zhiwei Gong
    • Zhenlong Wang

    Original Article 03 July 2020 Pages: 1167 - 1174

    

24. Breeding productivity, nest-site selection and conservation needs of the endemic Turkestan Ground-jay Podoces panderi

    • Robert J. Burnside
    • Alex L. Brighten
    • Anna Ten

    Original Article Open access 01 June 2020 Pages: 1175 - 1183

    

25. Age-related differences in reproductive success support the selection hypothesis in a Mute Swan population

    • Radosław Włodarczyk
    • Piotr Minias

    Original Article Open access 23 July 2020 Pages: 1185 - 1193