Sky Larks recorded per party hr on the Waipi'o Christmas Count, O'ahu,

1977-2007 (see Count Page), showing an increase through 1990 followed by a decline through the 2000s.

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/2009/