Daily Postcard: A Gunnison’s prairie dog standing proudly with its belly out on Fat Tuesday, Feb. 17, at Valles Caldera National Preserve. The Gunnison’s prairie dog is a highly social critter that inhabits the montane grasslands throughout the park, living in colonies that can contain hundreds of interconnected burrows, chambers, and underground tunnels. They are herbivores, so their diets consist primarily of plant matter, although they’re known to occasionally consume an insect or two. Adults weigh 23 to 42 ounces, with males averaging slightly larger than females. Photo by Todd  Cornwell/NPS