Summary: Density was greatest in agricultural habitats (8.2 magpies km -2) and least in urban habitats (1.3 magpies km-2). Abundance was greatest in rural habitats (245,221) and least in urban habitats (5,347). While non-significant, the potentially continued decline and restricted range of this species warrants further monitoring. For scrub jays, abundance estimates increased over the study period, from a low of 24 jays km -2 (2,340,187 jays) in February 2008 to a high of 78 jays km -2 (7,483,871 jays) in November 2008. A log-transformed regression showed a significant trend of 38% (p=0.004), suggesting any impact of WNV was mitigated by juvenile recruitment, and that scrub jay populations may be developing resistance to WNV. Density was greatest in agricultural habitats (98 jays km-2) and least in rural habitats (38 jays km-2). Abundance was greatest in agricultural habitats (2,578,360) and least in urban habitats (356,575). Inclusion of covariate data in modeling the probability of detecting birds often reduced the variance of density estimates or significantly improved model results.