1. Common patterns in the molecular phylogeography of western palearctic birds: a comprehensive review

   • Liviu G. Pârâu
   • Michael Wink

   Review Open access 13 May 2021 Pages: 937 - 959

   

2. Phylogeography of Habia fuscicauda (Cardinalidae) indicates population isolation, genetic divergence and demographic changes during the Quaternary climate shifts in the Mesoamerican rainforest

   • Vicente de J. Castillo-Chora
   • Luz E. Zamudio-Beltrán
   • Blanca E. Hernández-Baños

   Original Article 05 June 2021 Pages: 961 - 976

   

3. A new fossil from the early Oligocene of Provence (France) increases the diversity of early Gruoidea and adds constraint on the origin of cranes (Gruidae) and limpkin (Aramidae)

   • Antoine Louchart
   • Anaïs Duhamel

   Original Article 01 May 2021 Pages: 977 - 986

   

4. Stable isotopes (δ²H) in feathers identify non-breeding origins of the endangered Jankowski’s Bunting

   • Zheng Han
   • Hai-Tao Wang
   • Frédéric Jiguet

   Original Article 18 May 2021 Pages: 987 - 995

   

5. No evidence that nest site choice in Pied Flycatchers is mediated by assessing the clutch size of a heterospecific, the Great Tit

   • Tore Slagsvold
   • Karen L. Wiebe

   Original Article Open access 29 May 2021 Pages: 997 - 1007

   

6. Breeding latitude is associated with the timing of nesting and migration around the annual calendar among Purple Martin (Progne subis) populations

   • L. R. Neufeld
   • S. Muthukumarana
   • K. C. Fraser

   Original Article 18 May 2021 Pages: 1009 - 1024

   

7. Apparent survival and dispersal in a recovered Osprey population: effects of age, sex and social status

   • Ülo Väli
   • Aigars Kalvāns
   • Joosep Tuvi

   Original Article 04 July 2021 Pages: 1025 - 1034

   

8. Sex-specific growth of nestlings of the Whiskered Tern Chlidonias hybrida, a species with sexual size dimorphism and female brood desertion

   • Agata Banach
   • Grzegorz Neubauer
   • Mateusz Ledwoń

   Original Article Open access 16 July 2021 Pages: 1035 - 1047

   

9. Higher reproductive performance of a piscivorous avian predator feeding on lower trophic-level diets on ponds with shorter food chains

   • Janusz Kloskowski
   • Andrzej Trembaczowski
   • Maciej Filipiuk

   Original Article Open access 13 July 2021 Pages: 1049 - 1062

   

10. Body mass during the spring migration period of two long-lived seabirds varies with capture date, age, sex, and natal origin

    • David Monticelli
    • Hugues Defourny
    • André Degros

    Original Article 30 May 2021 Pages: 1063 - 1074

    

11. Differential spatial migration programmes are both sex and age specific for migratory great cormorants

    • Katherine R. S. Snell
    • Morten Frederiksen
    • Thomas Bregnballe

    Original Article 05 July 2021 Pages: 1075 - 1085

    

12. Mass occurrence and habitat selection of Common Redpolls (Carduelis flammea) after a large seed crop year: snow-covered ground facilitates food access

    • Svein Dale

    Original Article Open access 11 July 2021 Pages: 1087 - 1099

    

13. Gulls of a feather do not sleep whenever—circadian rhythm of activity of black-headed gulls Chroicocephalus ridibundus during the incubation period

    • Piotr Indykiewicz
    • Dariusz Jakubas
    • Julita Gerke

    Original Article Open access 29 May 2021 Pages: 1101 - 1114

    

14. The impact of Sosnowsky’s Hogweed on feeding guilds of birds

    • Emilia Grzędzicka
    • Jiří Reif

    Original Article Open access 26 May 2021 Pages: 1115 - 1128

    

15. Bird species use of Tapinanthus dodoneifolius mistletoes parasitising African locust bean trees Parkia biglobosa in Amurum Forest Reserve, Nigeria

    • Islamiat A. Raji
    • Adams A. Chaskda
    • Colleen T. Downs

    Original Article 11 May 2021 Pages: 1129 - 1140

    

16. Blood plasma biochemistry and the effects of age, sex, and captivity in Short-toed Snake Eagles (Circaetus gallicus)

    • Ryan Baumbusch
    • Virginia Morandini
    • Miguel Ferrer

    Original Article 09 June 2021 Pages: 1141 - 1151

    

17. Learning in advance? Interspecific recognition ability in male Eurasian blackcaps

    • Piotr Matyjasiak

    Original Article Open access 28 May 2021 Pages: 1153 - 1162

    

18. Seasonal and diurnal variation of vocal behaviour in duetting White-browed Sparrow Weavers

    • Cornelia Voigt
    • Stefan Leitner
    • Andries Ter Maat

    Original Article 19 June 2021 Pages: 1163 - 1172

    

19. Phonotactic responses of Brown Rats (Rattus norvegicus) to begging calls of Starling nestlings (Sturnus vulgaris)

    • Stephen Takács
    • Gerhard Gries

    Original Article 17 May 2021 Pages: 1173 - 1181

    

20. Call rate in Common Cuckoos does not predict body size and responses to conspecific playbacks

    • Zoltán Elek
    • Miklós Bán
    • Csaba Moskát

    Original Article Open access 17 July 2021 Pages: 1183 - 1192

    

21. How urban and rural birds respond to the colour of bird feeders?

    • Artur Golawski
    • Hubert Sytykiewicz

    Original Article Open access 02 July 2021 Pages: 1193 - 1198

    

22. Female song in the Cyprus Wheatear Oenanthe cypriaca

    • Robert Patchett
    • Alexander N. G. Kirschel
    • Will Cresswell

    Short Communication Open access 27 May 2021 Pages: 1199 - 1204