Extremely abundant everywhere.
Least Chipmunk (Eutamias minimus pictus)
Common about Mammoth Hot Springs.
Golden Ground-squirrel (Citellus lateralis cinerascens)
Common.
Picket-pin Ground-squirrel (Citellus armatus)
Abundant on all level prairies.
Prairie-dog (Cynomys ludovicianus)
Gen. Geo. S. Anderson told me long ago that the Prairie-dogs, so abundant on the Lower Yellowstone, were sometimes seen as far up as the Park at Gardiner.