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.

 

Species account

 

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/