California Quail recorded per party hr on the Volcano
Christmas Count, Hawai'i, 1972-2014 (see Count
Page), showing a decline in
presence during the 1970-1980s, and absence since 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/