Hatching asynchrony as a parental reproductive strategy in birds: a review of causes and consequences Ewa WęgrzynWiktor WęgrzynKonrad Leniowski Review Open access 31 March 2023 Pages: 477 - 497
A giant raptor (Aves: Accipitridae) from the Pleistocene of southern Australia Ellen K. MatherMichael S. Y. LeeTrevor H. Worthy Original Article Open access 15 March 2023 Pages: 499 - 526
The effects of temporally distinct light pollution from ships on nocturnal colony attendance in a threatened seabird Martin AustadSteffen OppelPetra Quillfeldt Original Article Open access 28 March 2023 Pages: 527 - 536
The presence of an invasive bird, the Common Starling, in an urban landscape: habitat use and relationships with other bird species Lucía IbañezFacundo X. PalacioDiego Montalti Original Article 17 February 2023 Pages: 537 - 546
Frequent duets, rare choruses, and extremely rare solos: year-round singing behavior in Chubb’s Cisticola Michał BudkaMarta PiaseckaTomasz Stanisław Osiejuk Original Article Open access 26 February 2023 Pages: 547 - 559
Young, wild, and free—Subadult White-naped Crane (Antigone vipio) exhibit wider home range movements than breeding adults during the summering period Ming GaoBaasansuren ErdenechimegYumin Guo Original Article 02 March 2023 Pages: 561 - 572
Regime shift and changes in sediment morphology driven by sea level rise affect abundance of migratory waders Karsten LaursenThomas BregnballeAnders Pape Møller Original Article Open access 03 March 2023 Pages: 573 - 582
Co-occurrence with Greylag Geese Anser anser and other factors affecting vigilance in White‑fronted Geese Anser albifrons during their spring staging in Central Europe Michał PolakowskiMonika BroniszewskaZbigniew Kasprzykowski Original Article Open access 25 March 2023 Pages: 583 - 590
The uropygial gland of the Great Cormorant (Phalacrocorax carbo): I. Morphology Nadine StangierSandra SandhöferClaudia Distler Original Article Open access 11 January 2023 Pages: 591 - 603
The uropygial gland of the Great Cormorant (Phalacrocorax carbo): II. Biochemical analysis of the uropygial secretion Jonas HolsteCarolin MüggeStefan Schulz Original Article Open access 05 May 2023 Pages: 605 - 619
Plasma chemistry and hematology reference values in wild nestlings of White-tailed Sea Eagles (Haliaeetus albicilla): effects of age, sex and hatching date Miguel FerrerRhian EvansD. Philip Whitfield Original Article Open access 17 March 2023 Pages: 621 - 628
Variation in plasma protein levels in House Finches (Haemorhous mexicanus): effects of season, disease state, and urbanization Dean J. DrakeKevin J. McGraw Original Article 23 March 2023 Pages: 629 - 638
Exposure to sulfur in soil explains pigmentation by pheomelanin in birds inhabiting Iceland Sol Rodríguez-MartínezÓlafur ArnaldsIsmael Galván Original Article Open access 25 February 2023 Pages: 639 - 649
The visual fields of the Harpy Eagle (Harpia harpyja) Anna E. BrewerWanderlei de MoraesBret A. Moore Original Article 22 March 2023 Pages: 651 - 658
Size-assortative mating in a long-lived monogamous seabird Francesca VisalliFederico De PascalisJacopo G. Cecere Original Article 27 March 2023 Pages: 659 - 667
Parental food provisioning and nestling growth under Philornis downsi parasitism in the Galapagos Green Warbler-Finch, classified as ‘vulnerable’ by the IUCN Courtney L. PikeBarbara KoflerSabine Tebbich Original Article Open access 18 February 2023 Pages: 669 - 676
Assessing genetic diversity patterns at neutral and adaptive loci to inform population reinforcement of an endangered migratory vulture Anastasios BounasVictoria Saravia-MullinKonstantinos Sotiropoulos Original Article Open access 10 February 2023 Pages: 677 - 688
Breeding biology of the African Pygmy Falcon: long-term variation and seasonal decline in breeding performance of an arid zone raptor Olufemi P. OlubodunAnthony M. LowneyRobert L. Thomson Original Article Open access 30 March 2023 Pages: 689 - 704
Importance of shallow river topography for inland breeding Common Terns Miloš MartinovićMladen PlantakJelena Kralj Original Article 14 March 2023 Pages: 705 - 716
Plant consumer innovation in skuas Samara DanelGaël BardonFrancesco Bonadonna Short Communication 09 March 2023 Pages: 717 - 719
Absence of song suggests heterogeneity of vocal-production learning in hummingbirds Amanda MonteMaria Luisa da SilvaManfred Gahr Short Communication Open access 21 March 2023 Pages: 721 - 727