The following article has been published on the Ornithology Exchange. This and other articles can be found under the Articles tab in the navigation menu or by clicking here. Editor's Choice: Breeding biology of Hawaiian birds and Uruguayan savanna avian assemblages Philip Stouffer, Editor The editor of the The Condor: Ornithological Applications highlights two recent publications. The first explores the breeding biology of two endangered Hawaiian forest birds. The second describes the structure of avian assemblages in grasslands associated with agriculture in the Uruguayan savanna ecoregion.