Though there are signs in various places around the Grand Canyon warning people not to attempt to attract, pet or feed the animals some of these critters are bold enough to come right up to the visitors and appear to be well aware of the treats available to them. Fuji X-T1, ISO 200, aperture priority, 18-55mm lens all at 55mm with various apertures and shutter speeds. As shown here, all at least 100% crop because unless you have food in your hand you cannot get really close to these critters without them running off and they are quite quick. This is one reason I always use a zoom instead of fixed focal length lenses. In several of these cases I had just taken a shot at the wide end of the focal length and a few seconds later after a few steps one of these critters appeared and they do not stick around long enough for you to be changing lenses etc. nor do they acknowledge your requests for specific poses. This critter seems quite proficient at getting treats and is in need of a weight reduction program. The post behind this critter which is munching on a potato chip is about 10 inches in diameter.