The goal of this long term monitoring study is to annually evaluate Cactus Wren population status on Conserved Lands in western San Diego County and to provide data to assess habitat condition. Metrics used to evaluate the overall status of the species include the proportion of cactus plots occupied by wrens and measures of habitat quality such as shrub overcrowding, cover of nonnative annual grasses, and prevalence of diseased and dead cactus. We collect data to determine territory and breeding status and summarize and compare habitat attributes for occupied and unoccupied survey plots.