Red-billed Leiothrixes
recorded per party hr on the Honolulu Christmas Count, 1944-2014 (see Count
Page), indicating a decline during the
1940-1960s to absence in the 1970-mid 1980s followed by a recovery in the
1990-2010s. See also Moulton and Scioli (1986),
Scott et al. (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/