George Sanker / Portrait of Golden Mantled Ground Squirrel (Spermophilus lateralis) with a blade of grass in its mouth. Yellowstone National Park, Wyoming, USA, May.

Diane McAllister / Golden manteled ground squirrel (Spermophilus lateralis) holding its tail. Yellowstone National Park, Wyoming, USA, May

George Sanker / American Red Fox (Vulpes vulpes) with Uinta ground squirrel (Urocitellus armatus) prey. Grand Teton National Park, Wyoming, USA, June.

George Sanker / American Red Fox (Vulpes vulpes) with Uinta ground squirrel (Urocitellus armatus) prey. Grand Teton National Park, Wyoming, USA, June.

David Pike / Uinta ground squirrel (Spermophilus armatus) calling. Springcreek Ranch, Jackson, Wyoming, USA.

David Pike / Uinta ground squirrel (Spermophilus armatus). Springcreek Ranch, Jackson, Wyoming, USA.

George Sanker / Coyote (Canis latrans) swallowing Uinta ground squirrel (Urocitellus armatus) prey, Yellowstone NP, Wyoming, USA

George Sanker / Golden-mantled Ground Squirrel (Callospermophilus lateralis) feeding on a blade of grass. Yellowstone National Park, Wyoming, USA, May.

George Sanker / Courting Golden-mantled Ground Squirrel (Callospermophilus / Spermophilus lateralis) on rocks. Yellowstone National Park, Wyoming, USA, May.

George Sanker / Female Red fox (Vulpes vulpes) with Ground squirrel (Spermophilus sp) prey, Grand Teton National Park, Wyoming, USA, June

George Sanker / Female Red fox (Vulpes vulpes) leaping after a ground squirrel, Grand Teton National Park, Wyoming, USA, June

George Sanker / Female Red fox (Vulpes vulpes) about to kill Ground squirrel, Grand Teton National Park, Wyoming, USA, June

George McCarthy / Uinta Ground Squirrel (Spermophilus armatus) standing in grass, Grand Teton National Park, Wyoming, USA

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.

Philippe Clement / Golden mantled ground squirrel {Spermophilus lateralis} Yellowstone, USA

Philippe Clement / Golden mantled ground squirrel {Spermophilus lateralis} Yellowstone, USA

Shin Yoshino / Unita Ground Squirrel (Spermophilus armatus) pair standing at burrow entrance, Yellowstone National Park, Wyoming

Mike Read / Uinta ground squirel on burrow {Spermophilus armatus} Grand Teton NP, WY, USA