Wyoming Ground Squirrel, Arapaho National Wildlife Refuge, Colorado

Ground squirrels can sometimes be hard to distinguish from prairie dogs. One way to tell them apart is their stance. Prairie dogs tend to lean forward (and are more rounded of body) while ground squirrels stand more upright. There are many different kinds of ground squirrel. This is the Wyoming ground squirrel, photographed in Arapaho National Wildlife Refuge in north central Colorado. Nikon D300 with Nikkor 200-400mm lens (at 400mm) ISO 400, f/5 at 1/800th of a second.