Results from IBP's 2006-2007 California Burrowing Owl survey have
now been published in:
Wilkerson, R. L., and R. B. Siegel.
2010. Assessing changes in the distribution and abundance of Burrowing
Owls in California, 1993-2007. Bird Populations 10:1-36.
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(large pdf - please be patient)
Wilkerson, R. L., and R. B. Siegel. 2011. Distribution and
abundance of Western Burrowing Owls (Athene cunicularia hypugaea)
in southeastern California. The Southwestern Naturalist 56:378-384.
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Proceedings of the California Burrowing Owl Symposium, November
2003 have been published as Bird Populations Monographs
No.1, 2007, and can be purchased from Albion Environmental,
Inc., at:
www.albionenvironmental.com/proceedings.html