We believe this, and the next beetle, are in one of two genera, Carabus or Calosoma. Getting an exact ID is challenging, so we appreciate you learning with us! Ground beetles (family Carabidae) are abundant and diverse. Both photos exemplify how most look; black, shiny, with grooved wing covers. Most are nocturnal hunters and can be found at lights at night and under debris during the day. Disturb their hiding places and they will scurry in all directions. If they can’t escape from danger, many will defend themselves with noxious secretions deployed from their anal glands. A lot of insects lead short lives, but ground beetles typically live two to three years as adults.
Photo by Marcy Allen on 5/2/30 in Missoula, MT.