Northern Cardinals recorded per party hr on the Honolulu
Christmas Count, 1944-2007 (see Count
Page), showing a significant decline through
the period. 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/