Roland Seitre / Black-tailed Prairie Dog (Cynomys ludovicianus), the main prey of Black-footed Ferrets, successfully reintroduced into the area. South Dakota, March 2002.

Gerrit Vyn / Black bear (Ursus americana) foraging for alpine berries during Autumn, Cascade Mountains, Washington, USA

John Cancalosi / Eastern Gray Squirrel (Sciurus carolinensis) in snow. New York, USA, January.

John Cancalosi / Two Blacktail Prairie Dogs (Cynomys ludovicianus) at entrance to underground burrows, Wyoming, USA, July

Shattil & Rozinski / Yellow-bellied marmot (Marmota flaviventris) portrait, looking out from between rocks, Wyoming, USA, North America

Shattil & Rozinski / Abert's squirrel {Sciurus aberti} USA

Shattil & Rozinski / Plains pocket gopher {Geomys bursarius} Colorado, USA

Shattil & Rozinski / Yellow bellied marmot {Marmota flaviventris} USA

Shattil & Rozinski / Plains pocket gopher {Geomys bursarius} Colorado, USA

Tom Vezo / Virginia opossum {Didelphis virginiana} note prehensile tail, captive, Montana, USA

Richard Du Toit / Smith's bush squirrel {Paraxerus cepapi} South Africa

John Cancalosi / Bush squirrel {Paraxerus sp} Zimbabwe

Bernard Castelein / North american red squirrel in winter coat {Tamiasciurus hudsonicus} Yellowstone NP, USA

Bernard Castelein / Olympic marmot {Marmota olympia} Olympic NP, Washington, USA

Bernard Castelein / Olympic Marmot (Marmota olympia) sitting up and watching, Olympic NP, Washington, USA