Reintroductions are an important management tool for recovering endangered species, but have low success rates in part due to behaviorally unequipped individuals. The inability for captive-born animals to recognize predators and/or respond with wild-type anti-predator behavior is especially problematic for small prey species. In our conservation breeding/reintroduction program for the endangered Pacific pocket mouse (Perognathus longimembris pacificus; PPM), results of antipredator experiments showed that captive-born individuals are less wary than wild-caught mice when presented with a terrestrial or aerial predator. We, therefore, initiated anti-predator training one month prior to the reintroduction with the goal of improving behavioral competency and release success. All mice slated for release (n = 25), and the alternates (n = 6) were exposed to a California king snake (Lampropeltis getula californiae) for 5 minutes pre- and post-training. The snake was contained within a Plexiglass unit with slits to allow PPM to experience olfactory as well as visual cues. Training consisted of pairing exposure to the snake with both a PPM distress call, and a physical thump under the testing arena in the event that the focal subject approached the snake. All trials were recorded, and behavior was quantified pre- and post-training to assess learning. Individuals that did not display the appropriate anti-predator response (e.g. freezing, retreating to cover, etc.) after training were removed from the release cohort, and replaced with a behaviorally competent alternate. The results of the experiment will be discussed.