Charlie Summers / Wyoming ground squirrel (Urocitellus elegans), standing alert. Arapaho National Wildlife Refuge, Colorado, USA, June.

Charlie Summers / Wyoming ground squirrel (Urocitellus elegans) standing to have a better look around. North Park, Arapaho Wildlife Refuge, Colorado, USA.

Charlie Summers / Wyoming ground squirrel (Urocitellus elegans), foraging for food in tall grass covered with dew. Arapaho National Wildlife Refuge, Colorado, USA, June.

Charlie Summers / Richrdson's ground squirrel (Urocitellus richardsonii) skimming the seeds off Western Wheatgrass. North Park, Colorado, USA. June.

Todd Mintz / Snowy owl (Bubo scandiaca) hunting on the Canadian prairie looking at a Richardson's ground squirrel (Urocitellus richardsonii) Saskatchewan, Canada, March

Charlie Summers / Wyoming ground squirrel (Urocitellus elegans) running across grass covered prairie, North Park, High Country, Colorado, USA.