The critically endangered Pacific pocket mouse (PPM; Perognathus longimembris pacificus) is a nocturnal solitary rodent restricted to coastal sage scrub habitat in southern California. Current knowledge of PPM habitat suitability is based on large-scale multi-year occupancy modeling of two extant populations, but little is known about microhabitat selection, especially in released populations. Understanding PPM microhabitat requirements is critical for informing habitat management efforts at reintroduction sites. To investigate this, we conducted focal behavioral observations at night to locate the burrows of captive-born PPM in the first active season following reintroduction. After we located the burrows, we conducted microhabitat surveys at natural burrow entrances, artificial acclimation burrows, and random locations within the reintroduction site. With these data, we are exploring the difference in microhabitat characteristics between the natural burrow and other locations to understand PPM microhabitat selection post-release. In addition to shedding light on PPM microhabitat selection, conducting behavioral observations has allowed us to fill information gaps in foraging and breeding behavior, burrow establishment and use, and interactions with heterospecifics for this cryptic species. We present preliminary data and highlight the value of behavioral observations by showcasing novel observations related to PPM natural history.