Red-crested Cardinals recorded per party hr on the
Honolulu Christmas Count, 1944-2007 (see Count
Page), showing a significant increase during
this 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/