Hawaiian Coots recorded per party hr on the Waipi'o Christmas Count, 1977-2014 (see Count
Page), showing an increasing
trend through the period. This trend may relate to local wetland conditions
and/or increased emigration of birds from Kaua'i
to O'ahu. Fluctuations in numbers apart from the
trends reflect favorable and unfavorable conditions for breeding, as
related primarily to rainfall totals (see also Common Moorhen and Hawaiian Stilt). 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/