Ingo Arndt / American Bison (Bison bison) bull and Arctic Ground Squirrels (Spermophilus parryii), Yellowstone National Park, Wyoming

Shattil & Rozinski / Wyoming ground squirrel {Spermophilus elegans} reaching up to feed, USA

Shattil & Rozinski / Wyoming ground squirrel {Spermophilus elegans} USA

Bernard Castelein / Golden mantled ground squirrel {Spermophilus lateralis} Yellowstone NP, Wyoming, USA

Nigel Bean / Wyoming ground squirrel {Spermophilus elegans}Rocky Mountain NP, Colorado, USA

Pete Cairns / Uinta Ground Squirrel (Spermophilus armatus) standing on hind legs in alert posture, Grand Teton National Park, Wyoming, USA.

Pete Cairns / Uinta Ground Squirrel (Spermophilus armatus) feeding in grassland, Grand Teton National Park, Wyoming, USA.

Pete Cairns / Uinta ground squirrel (Spermophilus armatus) alarm calling from edge of burrow, Yellowstone National Park, Wyoming, USA

Philippe Clement / Uinta ground squirrel {Spermophilus armatus} standing on tree-trunks, Grand Teton NP, Wyoming, USA.

Philippe Clement / Uinta ground squirrel feeding on flower{Spermophilus armatus} Grand Teton NP, Wyoming, USA.

Philippe Clement / Uinta ground squirrel {Spermophilus armatus} on tree-trunks, Grand Teton NP, Wyoming, USA.

Philippe Clement / Uinta ground squirrel {Spermophilus armatus} Grand Teton NP, Wyoming, USA.