1. Kites Milvus migrans lineatus (Milvus migrans migrans/lineatus) are spreading west across Europe

   • Mykola Skyrpan
   • Connor Panter
   • Ivan Literák

   Original Article 16 November 2020 Pages: 317 - 323

   

2. Ranging behaviour and habitat use in Montagu’s Harrier Circus pygargus in extensive farmland of Eastern Poland

   • Dominik Krupiński
   • Dorota Kotowska
   • Paweł Mirski

   Original Article Open access 20 November 2020 Pages: 325 - 337

   

3. Movements of Cyprus Wheatear Oenanthe cypriaca fledglings: evidence of a post-fledging home range away from the natal site prior to first migration

   • P. Styles
   • R. Patchett
   • W. Cresswell

   Original Article Open access 25 November 2020 Pages: 339 - 348

   

4. Migration strategy, site fidelity and population size of the globally threatened Sociable Lapwing Vanellus gregarius

   • Paul F. Donald
   • Johannes Kamp
   • Robert D. Sheldon

   Original Article 03 January 2021 Pages: 349 - 367

   

5. Stay or shift: does breeding success influence the decision in a cave-dwelling swiftlet?

   • Prathamesh Gurjarpadhye
   • Dhanusha Kawalkar
   • Shirish Manchi

   Original Article 03 January 2021 Pages: 369 - 379

   

6. Agriculture induces isotopic shifts and niche contraction in Horned Larks (Eremophila alpestris) of the Colorado Desert

   • Nicholas A. Mason
   • Philip Unitt
   • Jed P. Sparks

   Original Article 14 November 2020 Pages: 381 - 393

   

7. Correction to: Agriculture induces isotopic shifts and niche contraction in Horned Larks (Eremophila alpestris) of the Colorado Desert

   • Nicholas A. Mason
   • Philip Unitt
   • Jed P. Sparks

   Correction 03 April 2021 Pages: 395 - 395

8. Aspects of the feeding ecology of introduced Rose-ringed Parakeets Psittacula krameri in the urban landscape mosaic of Durban, KwaZulu-Natal Province, South Africa

   • Tinyiko C. Shivambu
   • Ndivhuwo Shivambu
   • Colleen T. Downs

   Original Article 24 November 2020 Pages: 397 - 407

   

9. Sex bias in parental care is associated with brood age and fledglings’ growth rate in Western Bluebirds Sialia mexicana

   • Belgica Porras-Reyes
   • Sergio Ancona
   • Bibiana Montoya

   Original Article 06 November 2020 Pages: 409 - 419

   

10. Evidence for seasonal changes in population structure of Reed Buntings (Emberiza schoeniclus) in the Lake Neusiedl Region: a stable-isotope approach

    • Barbara Kofler
    • Wolfgang Wanek
    • Christian H. Schulze

    Original Article Open access 22 January 2021 Pages: 421 - 433

    

11. Nocturnal singing by diurnal birds in Afrotropical highlands

    • Michał Budka
    • Anna Skierczyńska
    • Tomasz S. Osiejuk

    Original Article Open access 12 January 2021 Pages: 435 - 445

    

12. Effects of temperature and season on birds’ dawn singing behavior in a forest of eastern China

    • Sabah Mushtaq Puswal
    • Mei Jinjun
    • Fanglin Liu

    Original Article 07 January 2021 Pages: 447 - 459

    

13. A cross-sectional field study of fall song in Northern Mockingbirds Mimus polyglottos

    • David E. Gammon
    • Andrew C. Tovsky

    Original Article 06 January 2021 Pages: 461 - 468

    

14. Markov dependencies in the song syntax of Hermit Thrush (Catharus guttatus)

    • Luke C. McLean
    • Sean P. Roach

    Original Article 05 November 2020 Pages: 469 - 476

    

15. Low activities of digestive enzymes in the guts of herbivorous grouse (Aves: Tetraoninae)

    • Julianne Newman
    • Maya Maurer
    • Kevin D. Kohl

    Original Article 09 November 2020 Pages: 477 - 485

    

16. Differences in circulating corticosterone levels associated with elevation of breeding sites in Rufous-collared Sparrows Zonotrichia capensis

    • Yanina Poblete
    • Victor Gutierrez
    • Rodrigo A. Vásquez

    Original Article Open access 03 December 2020 Pages: 487 - 496

    

17. Glucocorticoids, state-dependent reproductive investment and success in the face of danger in a long-lived bird

    • Kristina Noreikienė
    • Kim Jaatinen
    • Markus Öst

    Original Article Open access 14 December 2020 Pages: 497 - 509

    

18. The extent of white plumage patches in female Pied Flycatchers Ficedula hypoleuca is negatively associated with corticosterone concentration in partly unpigmented feathers

    • Juan Moreno
    • Jimena López-Arrabé

    Original Article 04 January 2021 Pages: 511 - 520

    

19. Prevalence of hematozoan parasites in Red Kite nestlings from France

    • Michael Coeurdassier
    • Nicolas Bassin
    • Eve Afonso

    Original Article 06 November 2020 Pages: 521 - 527

    

20. Phylogeography, morphology and ecological niche modelling to explore the evolutionary history of Azure-crowned Hummingbird (Amazilia cyanocephala, Trochilidae) in Mesoamerica

    • Flor Rodríguez-Gómez
    • Yuyini Licona-Vera
    • Juan Francisco Ornelas

    Original Article 05 January 2021 Pages: 529 - 547

    

21. Population history of the Blue-backed Manakin (Chiroxiphia pareola) supports Plio-Pleistocene diversification in the Amazon and shows a recent connection with the Atlantic Forest

    • Nayla Fábia Ferreira do Nascimento
    • Carlos Eduardo Quevedo Agne
    • Helder Farias Pereira de Araujo

    Original Article 03 January 2021 Pages: 549 - 563

    

22. Birds of the Juruá River: extensive várzea forest as a barrier to terra firme birds

    • Glaucia Del-Rio
    • Marquette J. Mutchler
    • Donna C. Schmitt

    Original Article 02 January 2021 Pages: 565 - 577

    

23. Genetic diversity in captive Yellow Cardinals (Gubernatrix cristata) from Southern Brazil: implications for the management and conservation of an endangered species

    • Sandra Eloisa Bülau
    • Willian Thomaz Peçanha
    • Thales Renato Ochotorena de Freitas

    Original Article 04 February 2021 Pages: 579 - 591

    

24. A new passeriform (Aves: Passeriformes) from the early Oligocene of Poland sheds light on the beginnings of Suboscines

    • Zbigniew M. Bochenski
    • Teresa Tomek
    • Grzegorz Salwa

    Original Article Open access 01 February 2021 Pages: 593 - 604

    

25. Azure-winged Magpies Cyanopica cyanus passed the tasks on the Uzgiris-Hunt scale of object permanence

    • Lin Wang
    • Yunchao Luo
    • Zhongqiu Li

    Original Article 20 January 2021 Pages: 605 - 613

    

26. Validation of a non-invasive technique for quantifying a stress-associated biomarker in a southern African hornbill

    • Michelle Bouwer
    • Celiwe A. Ngcamphalala
    • Andrew E. McKechnie

    Short Communication 05 February 2021 Pages: 615 - 619

    

27. Drone-conducted counts as a tool for the rapid assessment of productivity of Sandwich Terns (Thalasseus sandvicensis)

    • Roberto G. Valle
    • Francesco Scarton

    Technical Note 18 January 2021 Pages: 621 - 628

    

28. Correction to: Factors controlling the migration phenology of Siberian Phylloscopus species

    • László Bozó
    • Tibor Csörgő
    • Wieland Heim

    Correction 17 March 2021 Pages: 629 - 630