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

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

Andrew Parkinson / Red Fox (Vulpes vulpes) in meadow of buttercups. Derbyshire, UK, June. British Wildlife Photographer of the Year (BWPA) competition 2012, 'Outdoor Photography editor's choice' category. (Non-ex)

Erlend Haarberg / Male Arctic fox (Alopex lagopus) in summer coat, standing on hind legs in flower meadow, Hornstrandir Nature Reserve, West-fjords, Iceland, July

David Welling / Utah Prairie Dog (Cynomys parvidens) standing on watch outside their burrow. Bryce Canyon National Park, Utah, USA, August.

Charlie Summers / Three Western Black-tailed Prairie Dogs (Cynomys ludovicianus) at entrance to burrow. Cheyenne River drainage south of Hot Springs, South Dakota, USA

John Cancalosi / Blacktail Prairie Dog (Cynomys ludovicianus) engaging in Jump-yip behavior - A strong arch of the back or "jump" followed by a shrill "yip" - Thought to occur when a predator has left the area and in...

Charlie Summers / Black-tailed Prairie dog (Cynomys ludovicianus) on hind legs, emitting territorial call, Downtown Parker, Colorado, USA, North America

Colin Varndell / Three month old Red fox (Vulpes vulpes) cub walking through meadow, Dorset, England, UK June

Wild Wonders of Europe / O. Haarberg / Arctic fox (Alopex lagopus) in wild flower meadow, dark summer phase, Hornstrandir, Iceland, July 2008