Mariana Swiftlets recorded per party hr on the Honolulu Christmas Count, 1944-

2014 (see Count Page), indicating expansion of numbers after introduction in the

1960s. Fluctuations likely result from variation in foraging areas on count day.


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