“…Two of the most widespread invasive cavity‐nesters in North America are the European Starling ( Sturnus vulgaris ) and House Sparrow ( Passer domesticus ), both native to Europe, southwest Asia, and northern Africa (Cabe, ; Lowther & Link, ). Originally introduced into the United States from Europe in the mid to late 1800s, European Starlings and House Sparrows were ubiquitous breeding birds throughout most of the United States and southern Canada, and elsewhere, by the mid‐20th century (Cabe, ; Lowther & Link, ). Within their native range, both House Sparrows and European Starlings are effective competitors for nest cavities, via both interference (Goldshtein, Markman, Leshem, Puchinsky, & Charter, ; Van Balen, Booy, Van Franeker, & Osieck, ) and exploitation (Charter, Leshem, & Izhaki, ) competition.…”