Birds of a feather don’t always flock together: variation in molt origins and movement patterns of winter finches in Ontario Kevin C. HannahKevin J. KardynalKeith A. Hobson Original Article 18 March 2020 Pages: 609 - 620
Environment influences the geographic phenotypic variation in Velazquez’s Woodpecker (Centurus santacruzi) Pilar BenitesMuir D. EatonAdolfo G. Navarro-Sigüenza Original Article 05 March 2020 Pages: 621 - 634
A molecular analysis of the mysterious Vaurie’s Nightjar Caprimulgus centralasicus yields fresh insight into its taxonomic status Manuel SchweizerClaudia EtzbauerGuy M. Kirwan Original Article 25 March 2020 Pages: 635 - 650
Observations on the relationships of some Sundaic passerine taxa (Aves: Passeriformes) previously unavailable for molecular phylogenetic study Subir B. ShakyaM. IrhamFrederick H. Sheldon Original Article 24 March 2020 Pages: 651 - 664
Molecular assessment of the distribution and taxonomy of the Lesser Whitethroat Sylvia curruca complex in Iran, with particular emphasis on the identity of the contentious taxon, zagrossiensis Sarudny, 1911 Raziyeh AbdilzadehMansour AliabadianUrban Olsson Original Article 15 April 2020 Pages: 665 - 676
Microclimate affects the distribution of grassland birds, but not forest birds, in an Alpine environment Susanne JähnigMartha Maria SanderDan Chamberlain Original Article 09 April 2020 Pages: 677 - 689
Declining peatland bird numbers are not consistent with the increasing Common Crane population Sara FraixedasAndreas LindénAleksi Lehikoinen Original Article Open access 09 April 2020 Pages: 691 - 700
Spatial variation in morphology of the White-browed Laughingthrush (Garrulax sannio) and its relationship with climate conditions in southern China Longying WenJanine M. AntalffyYong Wang Original Article 04 April 2020 Pages: 701 - 711
Late Pleistocene owls (Aves, Strigiformes) from Ecuador, with the description of a new species Gastón E. Lo CocoFederico L. AgnolínJosé Luis Román Carrión Original Article 05 March 2020 Pages: 713 - 721
Present and future potential distribution of the endangered Anairetes alpinus (Passeriformes: Tyrannidae) under global climate change scenarios P. Joser AtauchiConstantino Aucca-ChutasDavid A. Prieto-Torres Original Article 18 March 2020 Pages: 723 - 738
Population dynamics and regulation of the Middle Spotted Woodpecker in strictly protected and managed forests in Western Poland Ziemowit KosińskiŁukasz Walczak Original Article Open access 31 March 2020 Pages: 739 - 751
Sex- but not age-biased wind turbine collision mortality in the White-tailed Eagle Haliaeetus albicilla Christian HeuckChristof HerrmannJörg Albrecht Original Article 05 March 2020 Pages: 753 - 757
Vanishing wildlife in populated areas: the demise of the Andalusian Buttonquail Carlos Gutiérrez-ExpósitoEloy RevillaMiguel Clavero Original Article 30 March 2020 Pages: 759 - 768
Spatial convergence of meadow passerine territory distribution with mowing delay: an experiment in lowland grasslands Joël BroyerSoumaya BelghaliPhilibert Soufflot Original Article 18 March 2020 Pages: 769 - 778
Autumn migratory departure is influenced by reproductive timing and weather in an Arctic passerine Helen E. ChmuraJesse S. KrauseJohn C. Wingfield Original Article 05 March 2020 Pages: 779 - 791
Stopover dynamics of 12 passerine migrant species in a small Mediterranean island during spring migration Ivan MagginiMarta TrezLeonida Fusani Original Article Open access 30 March 2020 Pages: 793 - 802
Heterozygosity and fitness in a threatened songbird: blood parasite infection is explained by single-locus but not genome-wide effects Justyna KubackaEdyta PodmokłaAnna Dubiec Original Article Open access 05 March 2020 Pages: 803 - 817
Experimental nest replacement suggests that the bacterial load of nests may mediate nestling physiological condition in cavity nesting Great Tits (Parus major) Agnieszka ZabłotniAdam KalińskiJerzy Bańbura Original Article Open access 14 March 2020 Pages: 819 - 828
Effect of food availability on offspring sex ratios in replacement clutches of Mew Gulls (Larus canus) and Black-headed Gulls (Chroicocephalus ridibundus) in the highly unstable environment of the Vistula River Dariusz BukacińskiMonika BukacińskaPrzemysław Chylarecki Original Article Open access 19 March 2020 Pages: 829 - 847
Evidence of non-random mating in a colour polymorphic raptor, the Booted Eagle Josep BoschJosé Francisco CalvoMaría Victoria Jiménez-Franco Original Article 20 March 2020 Pages: 849 - 857
Voice breaking and its relation to body mass and testosterone level in the Siberian Crane (Leucogeranus leucogeranus) Anna V. KlenovaMaria V. GoncharovaSergey V. Naidenko Original Article 02 April 2020 Pages: 859 - 871
Song variation in the Caatinga suboscine Silvery-cheeked Antshrike (Sakesphorus cristatus) suggests latitude and São Francisco River as drivers of geographic variation Daniel CapelliHenrique Batalha-FilhoHilton Ferreira Japyassú Original Article 04 May 2020 Pages: 873 - 884
Age distribution and longevity in a breeding population of Swainson’s Hawks, Buteo swainsoni Sarah A. KaneChristopher R. VennumChristopher W. Briggs Original Article 24 April 2020 Pages: 885 - 891
Adjusting trail cameras to improve monitoring of small open cup nesting birds Larissa UheKlaus AlbrechtJan O. Engler Technical Note 13 March 2020 Pages: 893 - 899
Simpler methods can outperform more sophisticated ones when assessing bird migration starting date G. CerritelliL. VanniD. Giunchi Short Communication 30 March 2020 Pages: 901 - 907
Leukocyte coping capacity as a complementary stress metric in migrating birds Nikolaus HuberVirginie CanoineLeonida Fusani Short Communication Open access 01 April 2020 Pages: 909 - 913
Exposure of White-throated Dippers to heavy metals in acidified and non-acidified streams in Norway Hans Christian PedersenSigne NybøBrett K. Sandercock Short Communication Open access 08 April 2020 Pages: 915 - 921