We did not have observations of Common Nighthawks nesting on these roofs, but buildings were chosen based on accessibility, large size, and representation of the range of gravel sizes available as nest substrate.
Our findings indicate that predation by American Crows on the eggs of Common Nighthawks could occur more frequently in an urban environment than in natural, rural habitats.
But studying natural nests is preferred to gain a fuller understanding of predator pressure on Common Nighthawks.
Observations on the incubation behavior of a Common Nighthawk.
Means ([+ or -] SE), ranges, and sample sizes of nestling movements of Common Nighthawks within three age classes in Grand Teton National Park, Wyoming, 2010.
Clutch size of Common Nighthawks is similar across a broad geographic area with two-egg clutches dominant in Idaho (24 of 27 clutches; Rust 1947), the northern Great Plains (18 of 21; Kantrud and Higgins 1992), New Jersey (16 of 17; this study), and Florida (13 of 14; Perkins and Vickery 2007).
Nest site selection and nest thermal properties of Common Nighthawks on the tallgrass prairie of Kansas.
Migration and nesting of Common Nighthawks in northern Idaho.
More recently, Kent (1999) observed a group of about 40 small birds mobbing a Common Nighthawk
in Iowa on 30 August 1999.