Similar differences in nesting
success between roof- and ground-nests have been reported in other
ground-nesting species (Fisk 1978, Gore & Kinnison 1991). These
differences have been partly attributable to the different types of
predators that ground- and roof-nests are exposed to (Fisk 1978,
Massey & Fancher 1989, Gore & Kinnison 1991).