Víctor R. Cueto Scale in ecology: its importance for the study of avian habitat selection https://doi.org/10.56178/eh.v21i1.793 PDF (Spanish) 1-13
E. Manuela Pujol , Myriam E. Mermoz Reconstruction of ancestral states of life-history traits in cowbirds: an analysis of adaptations to brood parasitism https://doi.org/10.56178/eh.v21i1.794 PDF (Spanish) 15-23
Carlos M. Leveau, Lucas M. Leveau Bird assemblages in wooded streets along three coastal cities in Southeastern Buenos Aires Province, Argentina https://doi.org/10.56178/eh.v21i1.795 PDF (Spanish) 25-30
Ana Trejo, Marcelo Kun, Susana Seijas Diet of Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) in a west–east transect in the ecotone of northern Patagonia https://doi.org/10.56178/eh.v21i1.796 PDF (Spanish) 31-36
Alejandro Bodrati , Kristina Cockle, Juan Ignacio Areta, Gabriel Capuzzi, Rodrigo Fariña The Blue-winged Macaw (Primolius maracana) in Argentina: from pest to extinction in 50 years? https://doi.org/10.56178/eh.v21i1.797 PDF (Spanish) 37-43
Viviane Barquete, Leandro Bugoni, Rodolfo P. Silva-Filho, Andréa C. Adornes Review of records and notes on King Penguin (Aptenodytes patagonicus) and Rockhopper Penguin (Eudyptes chrysocome) in Brazil https://doi.org/10.56178/eh.v21i1.798 PDF 45-48
Juan Carlos Chebez, Rodrigo Castillo, Roberto Güller, Carlos Ferrari Confirmation of the presence of the Swallow-tailed Hummingbird (Eupetomena macroura) in Argentina https://doi.org/10.56178/eh.v21i1.799 PDF (Spanish) 49-51
Ramón Alberto Sosa Ecology and conservation of the Willow Flycatcher https://doi.org/10.56178/eh.v21i1.800 PDF (Spanish) 53-56
Jaime R. Rau Annotated checklist of the birds of Chile https://doi.org/10.56178/eh.v21i1.801 PDF (Spanish) 56-57