Mole-gopher or Gray Gopher (Thomomys talpoides)
A Gopher of some kind abounds in the Park. I assume it to be this.
Rocky Mt. Jumping Mouse (Zapus princeps)
Found in all the surrounding country, and recorded by E. A. Preble from near Yellowstone Lake.
Yellow-haired Porcupine (Erethizon epixanthus)
Somewhat common in the pine woods on the Continental Divide.
Coney, Rock Rabbit, Pika, or Calling Hare (Ochotona princeps)
Abundant in all slide rock.
Rocky Mt. Cottontail (Sylvilagus nuttalli grangeri)
Plentiful about Gardiner and in some of the lower regions of the Park, but not general.