Jim Brandenburg / Arctic Ground Squirrel (Spermophilus parryii) standing guard, Alaska

Michio Hoshino / Arctic Ground Squirrel (Spermophilus parryii) peeking out of its hole, Alaska

Ingo Arndt / Arctic Ground Squirrel (Spermophilus parryii) hibernating in burrow, Fairbanks, Alaska

Ingo Arndt / Arctic Ground Squirrel (Spermophilus parryii) hibernating in burrow, Fairbanks, Alaska

Vladimir Medvedev / Arctic / Parry's ground squirrel (Spermophilus parryii, Magadan oblast, Far East Russia, May

Vladimir Medvedev / Arctic / Parry's ground squirrel (Spermophilus parryii, Magadan oblast, Far East Russia, May

Vladimir Medvedev / Arctic / Parry's ground squirrel (Spermophilus parryii, Magadan oblast, Far East Russia, May

Donald M. Jones / Arctic Ground Squirrel (Spermophilus parryii) standing guard, Denali National Park, Alaska

Donald M. Jones / Arctic Ground Squirrel (Spermophilus parryii), Denali National Park, Alaska

Michael Quinton / Arctic Ground Squirrel (spermophilus parryii) hanging from rock, Yukon, Canada

Michael Quinton / Arctic Ground Squirrel (spermophilus parryii), Yukon, Canada

Michael Quinton / Arctic Ground Squirrel (spermophilus parryii) standing on hind legs, Yukon, Canada

Michael Quinton / Arctic Ground Squirrel (spermophilus parryii) melanistic dark coloring, Alaska

Konstantin Mikhailov / Arctic / Parry's Ground squirrel (Spermophilus parryii; Sciuridae) sitting on hind legs, in upland tundra in autumn. Denali NP, Alaska, USA, North America.

Konstantin Mikhailov / Arctic / Parry's Ground squirrel (Spermophilus parryii; Sciuridae) foraging on upland tundra in autumn. Denali NP, Alaska, USA, North America.

Konstantin Mikhailov / Arctic / Parry's Ground squirrel (Spermophilus parryii; Sciuridae) on upland tundra in autumn. Denali NP, Alaska, USA, North America.

Jim Brandenburg / Arctic Ground Squirrel (Spermophilus parryii) standing guard, Alaska

Michio Hoshino / Grizzly Bear (Ursus arctos horribilis) chasing Arctic Ground Squirrel (Spermophilus parryii), Denali National Park and Preserve, Alaska

Yva Momatiuk & John Eastcott / Arctic Ground Squirrel (Spermophilus parryii) on rock looking around for predators, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Arctic Ground Squirrel (Spermophilus parryii) on rock looking around for predators, Denali National Park, Alaska

Michael Quinton / Arctic Ground Squirrel (Spermophilus parryii) chewing on sign, Denali National Park, Alaska

Suzi Eszterhas / Arctic Ground Squirrel (Spermophilus parryii) adult standing alert

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

Staffan Widstrand / Parry's / Arctic Ground Squirrel {Spermophilus parryii} Siberia, Russia

Philippe Clement / Arctic / Parry's ground squirrel {Spermophilus parryii} feeding on tundra in autumn. Denali NP, Alaska, USA

Philippe Clement / Arctic / Parry's ground squirrel {Spermophilus parryii} on tundra in autumn. Denali NP, Alaska, USA

Philippe Clement / Arctic / Parry's ground squirrel {Spermophilus parryii} on tundra in autumn. Denali NP, Alaska, USA

Philippe Clement / Arctic / Parry's ground squirrel {Spermophilus parryii} on tundra in autumn. Denali NP, Alaska, USA

Philippe Clement / Arctic / Parry's ground squirrel {Spermophilus parryii} on tundra in autumn. Denali NP, Alaska, USA

Steven Kazlowski / Parry's / Arctic ground squirrel {Spermophilus parryii} Denali National Park, Alaska, USA

Steven Kazlowski / Parry's / Arctic ground squirrel {Spermophilus parryii} Denali National Park, Alaska, USA

Igor Shpilenok / Parry's Ground squirrel / Arctic souslik {Spermophilus parryi} Kronotsky Zapovednik, Russia.

Igor Shpilenok / Parry's Ground squirrel / Arctic souslik {Spermophilus parryi} Kronotsky Zapovednik, Russia.

Yva Momatiuk & John Eastcott / Arctic Ground Squirrel (Spermophilus parryii) alert adult, summer, Denali National Park and Preserve, Alaska

Yva Momatiuk & John Eastcott / Arctic Ground Squirrel (Spermophilus parryii) on alert, Denali National Park and Preserve, Alaska

Yva Momatiuk & John Eastcott / Arctic Ground Squirrel (Spermophilus parryii) alert in tundra, summer, Denali National Park and Preserve, Alaska

Michio Hoshino / Arctic Ground Squirrel (Spermophilus parryii) grasping grass stems, Alaska

Michael Quinton / Arctic Ground Squirrel (Spermophilus parryii) feeding on butterfly, Alaska

Michio Hoshino / Arctic Ground Squirrel (Spermophilus parryii) clinging to branch, Alaska

Michio Hoshino / Arctic Ground Squirrel (Spermophilus parryii) on snowy ground, Alaska

Michio Hoshino / Arctic Ground Squirrel (Spermophilus parryii) standing alert, Alaska

Michael Quinton / Arctic Ground Squirrel (Spermophilus parryii) feeding on grasses, Alaska

Michio Hoshino / Arctic Ground Squirrel (Spermophilus parryii) feeding on plant, Alaska

Eric Baccega / Parry's / Arctic ground squirrel {Spermophilus parryii} Alaska, USA

Eric Baccega / Parry's / Arctic ground squirrel {Spermophilus parryii} Alaska, USA

Donald M. Jones / Arctic Ground Squirrel (Spermophilus parryii), Denali National Park, Alaska

Donald M. Jones / Arctic Ground Squirrel (Spermophilus parryii), Denali National Park, Alaska

Michael Quinton / Arctic Ground Squirrel (spermophilus parryii) melanistic dark coloring, Yukon, Canada

Michael Quinton / Arctic Ground Squirrel (spermophilus parryii) reaching for grass, Yukon, Canada

Michael Quinton / Arctic Ground Squirrel (spermophilus parryii) melanistic dark coloring, Alaska

Yva Momatiuk & John Eastcott / Arctic Ground Squirrel (Spermophilus parryii) standing on road, Dalton Highway, Alaska

Yva Momatiuk & John Eastcott / Arctic Ground Squirrel (Spermophilus parryii) standing on road, Dalton Highway, Alaska

Michael Quinton / Arctic Ground Squirrel (Spermophilus parryii) gnawed sign, Denali National Park, Alaska

Gerry Ellis / Arctic Ground Squirrel (Spermophilus parryii) standing on hind legs to look for danger, Arctic National Wildlife Refuge, Alaska

Patricio Robles Gil / Arctic Ground Squirrel (Spermophilus parryii) adult standing alert on the tundra, Northwest Territories, Canada

Staffan Widstrand / Parry's ground squirrel {Spermophilus parryii} standing on hind legs, Yukon, Canada