The San Clemente Island loggerhead shrike (Lanius ludovicianus mearnsi) is one of the most endangered avian sub-species in North America. The effective population size peaked in the late 2000s, but in recent years has ranged between 32 and 137 individuals. Nest failure associated with predation events has been considered a major factor inhibiting recovery. The US Navy leads recovery efforts, which includes releasing captive-bred individuals, non-native predator control, and extensive monitoring. To better support this mission, understanding potential impacts of other factors that may be limiting population recovery, such as climate change, changes in breeding habitat composition, fire impacts, and prey availability, are critical in managing this subspecies. Additional investigations are underway to address data gaps as part of an overall recovery management plan. These efforts include conducting a population viability analysis, assessing habitat factors associated with successful nesting, and investigating over-winter survival. We are also investigating the feasibility of evaluating the effects of invasive plant densities on prey abundance and/or availability. In this talk we will discuss our approaches to filling these data gaps, and initial results from some of the tasks already underway.