Not knowing much about skylarks, I did a brief google search and came up
with two interesting local articles, about 25 years apart. Apparently
they're gone from WA, but some may remain in BC.

http://birding.bc.ca/articles/skylarks.htm
http://elibrary.unm.edu/sora/Auk/v091n04/p0832-p0835.pdf

Kevin Li
Ballard, USA