KERLINGER, P., and M.R. LEIN. 1988. Causes of mortality, fat
condition, and weights of wintering Snowy Owls. J. Field Ornithol. 59:7-12.
http://elibrary.unm.edu/sora/JFO/v059n01/p0007-p0012.pdf

--
Mike Patterson
Astoria, OR
celata at pacifier.com

Christmas Bird Count Calendar and FAQ for Oregon and Washington
http://home.pacifier.com/~mpatters/cbc/cbc_WAOR_reg.html