House Sparrows recorded per party hr on the Honolulu
Christmas Count, 1944-2007 (see Count
Page), indicating increases during the
1950-1970s following by declines during the 1980-2000s. See also Moulton
and Scioli (1986), Williams (1987), and Ralph
(1990). Graphs of Christmas Count data
developed as part of The Birds of the Hawaiian Islands: Occurrence, History, Distribution, and
Status by Robert L. Pyle and Peter Pyle http://hbs.bishopmuseum.org/birds/rlp-monograph/2009/