Paul Hobson / Red squirrel (Sciurus vulgaris) jumping towards camera. Scotland, UK. February.

Donald M. Jones / Black-tailed Prairie Dog (Cynomys ludovicianus) group, South Dakota

Donald M. Jones / Black-tailed Prairie Dog (Cynomys ludovicianus) pair greeting, South Dakota

Donald M. Jones / Black-tailed Prairie Dog (Cynomys ludovicianus) pair greeting, South Dakota

Enrique Lopez-Tapia / Himalayan marmot (Marmota himalayana). Chantang Wildlife Sanctuary. Ladakh, India,

Erlend Haarberg / Red squirrel (Sciurus vulgaris) hiding in a tree trunk, Klaebu, Norway, September.

Stephane Granzotto / Alpine marmot (Marmota marmota) standing alert outside burrow, takes fright and runs inside, Rhone-Alpes, France, July.

Sergey Gorshkov / Northern goshawk (Accipiter gentilis) flying with squirrel prey, Finland . March

Sergey Gorshkov / Northern goshawks (Accipiter gentilis) fighting over squirrel carcass, Finland, March.

Yva Momatiuk & John Eastcott / Black-tailed Prairie Dog (Cynomys ludovicianus) on alert, Theodore Roosevelt National Park, North Dakota

Donald M. Jones / Yellow-bellied Marmot (Marmota flaviventris) yawning, central Montana

Donald M. Jones / Red Squirrel (Tamiasciurus hudsonicus) on pine cone flakes, western Montana