Common (Hawaiian) Moorhens recorded per party hr on the
Honolulu Christmas Count, 1944-2007 (see Count
Page), and 1946-2007 (showing more detail
without the high 1945 total) indicating cyclic trends, with peaks in the early
1960s, around 1979-1980, and in the early 2000s. 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/