Mule deer (Odocoileus hemionus) are social animals that typically stay in groups. Females and their offspring form multi-generational herds. Only during the fawning season do these familial groups temporarily disperse. Bucks and young males either remain single or group together through most of the year. In the late fall and winter the family groups sometimes form larger aggregations for protection during the winter.
Mule deer also have a habit, when escaping from perceived danger, of stopping and turning around to look at their pursuer.
Leonard and I recently came upon a large herd of mule deer along the Wildflower Trail at Ash Creek Wildlife Area (Lassen County CA). The deer moved off a little way then stood and watched us as we walked past. They did not appear overly concerned by our presence. We feel so fortunate to have these beautiful animals as part of our daily lives.