Kites Milvus migrans lineatus (Milvus migrans migrans/lineatus) are spreading west across Europe Mykola SkyrpanConnor PanterIvan Literák Original Article 16 November 2020 Pages: 317 - 323
Ranging behaviour and habitat use in Montagu’s Harrier Circus pygargus in extensive farmland of Eastern Poland Dominik KrupińskiDorota KotowskaPaweł Mirski Original Article Open access 20 November 2020 Pages: 325 - 337
Movements of Cyprus Wheatear Oenanthe cypriaca fledglings: evidence of a post-fledging home range away from the natal site prior to first migration P. StylesR. PatchettW. Cresswell Original Article Open access 25 November 2020 Pages: 339 - 348
Migration strategy, site fidelity and population size of the globally threatened Sociable Lapwing Vanellus gregarius Paul F. DonaldJohannes KampRobert D. Sheldon Original Article 03 January 2021 Pages: 349 - 367
Stay or shift: does breeding success influence the decision in a cave-dwelling swiftlet? Prathamesh GurjarpadhyeDhanusha KawalkarShirish Manchi Original Article 03 January 2021 Pages: 369 - 379
Agriculture induces isotopic shifts and niche contraction in Horned Larks (Eremophila alpestris) of the Colorado Desert Nicholas A. MasonPhilip UnittJed P. Sparks Original Article 14 November 2020 Pages: 381 - 393
Correction to: Agriculture induces isotopic shifts and niche contraction in Horned Larks (Eremophila alpestris) of the Colorado Desert Nicholas A. MasonPhilip UnittJed P. Sparks Correction 03 April 2021 Pages: 395 - 395
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. ShivambuNdivhuwo ShivambuColleen T. Downs Original Article 24 November 2020 Pages: 397 - 407
Sex bias in parental care is associated with brood age and fledglings’ growth rate in Western Bluebirds Sialia mexicana Belgica Porras-ReyesSergio AnconaBibiana Montoya Original Article 06 November 2020 Pages: 409 - 419
Evidence for seasonal changes in population structure of Reed Buntings (Emberiza schoeniclus) in the Lake Neusiedl Region: a stable-isotope approach Barbara KoflerWolfgang WanekChristian H. Schulze Original Article Open access 22 January 2021 Pages: 421 - 433
Nocturnal singing by diurnal birds in Afrotropical highlands Michał BudkaAnna SkierczyńskaTomasz S. Osiejuk Original Article Open access 12 January 2021 Pages: 435 - 445
Effects of temperature and season on birds’ dawn singing behavior in a forest of eastern China Sabah Mushtaq PuswalMei JinjunFanglin Liu Original Article 07 January 2021 Pages: 447 - 459
A cross-sectional field study of fall song in Northern Mockingbirds Mimus polyglottos David E. GammonAndrew C. Tovsky Original Article 06 January 2021 Pages: 461 - 468
Markov dependencies in the song syntax of Hermit Thrush (Catharus guttatus) Luke C. McLeanSean P. Roach Original Article 05 November 2020 Pages: 469 - 476
Low activities of digestive enzymes in the guts of herbivorous grouse (Aves: Tetraoninae) Julianne NewmanMaya MaurerKevin D. Kohl Original Article 09 November 2020 Pages: 477 - 485
Differences in circulating corticosterone levels associated with elevation of breeding sites in Rufous-collared Sparrows Zonotrichia capensis Yanina PobleteVictor GutierrezRodrigo A. Vásquez Original Article Open access 03 December 2020 Pages: 487 - 496
Glucocorticoids, state-dependent reproductive investment and success in the face of danger in a long-lived bird Kristina NoreikienėKim JaatinenMarkus Öst Original Article Open access 14 December 2020 Pages: 497 - 509
The extent of white plumage patches in female Pied Flycatchers Ficedula hypoleuca is negatively associated with corticosterone concentration in partly unpigmented feathers Juan MorenoJimena López-Arrabé Original Article 04 January 2021 Pages: 511 - 520
Prevalence of hematozoan parasites in Red Kite nestlings from France Michael CoeurdassierNicolas BassinEve Afonso Original Article 06 November 2020 Pages: 521 - 527
Phylogeography, morphology and ecological niche modelling to explore the evolutionary history of Azure-crowned Hummingbird (Amazilia cyanocephala, Trochilidae) in Mesoamerica Flor Rodríguez-GómezYuyini Licona-VeraJuan Francisco Ornelas Original Article 05 January 2021 Pages: 529 - 547
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 NascimentoCarlos Eduardo Quevedo AgneHelder Farias Pereira de Araujo Original Article 03 January 2021 Pages: 549 - 563
Birds of the Juruá River: extensive várzea forest as a barrier to terra firme birds Glaucia Del-RioMarquette J. MutchlerDonna C. Schmitt Original Article 02 January 2021 Pages: 565 - 577
Genetic diversity in captive Yellow Cardinals (Gubernatrix cristata) from Southern Brazil: implications for the management and conservation of an endangered species Sandra Eloisa BülauWillian Thomaz PeçanhaThales Renato Ochotorena de Freitas Original Article 04 February 2021 Pages: 579 - 591
A new passeriform (Aves: Passeriformes) from the early Oligocene of Poland sheds light on the beginnings of Suboscines Zbigniew M. BochenskiTeresa TomekGrzegorz Salwa Original Article Open access 01 February 2021 Pages: 593 - 604
Azure-winged Magpies Cyanopica cyanus passed the tasks on the Uzgiris-Hunt scale of object permanence Lin WangYunchao LuoZhongqiu Li Original Article 20 January 2021 Pages: 605 - 613
Validation of a non-invasive technique for quantifying a stress-associated biomarker in a southern African hornbill Michelle BouwerCeliwe A. NgcamphalalaAndrew E. McKechnie Short Communication 05 February 2021 Pages: 615 - 619
Drone-conducted counts as a tool for the rapid assessment of productivity of Sandwich Terns (Thalasseus sandvicensis) Roberto G. ValleFrancesco Scarton Technical Note 18 January 2021 Pages: 621 - 628
Correction to: Factors controlling the migration phenology of Siberian Phylloscopus species László BozóTibor CsörgőWieland Heim Correction 17 March 2021 Pages: 629 - 630