Daily Postcard: A long-tailed weasel pokes its head up from behind snowy rocks and scans the area Wednesday at Valles Caldera National Preserve. This weasel is a tiny but scrappy mammal found in the grasslands and woodlands of Valles Caldera. It  primarily eats lizards, small birds and rodents, but occasionally will prey on animals larger than itself, lending to its reputation as a ferocious hunter. The most common weasel sightings at Valles Caldera take place near prairie dog towns where they frequently hunt. The long-tailed weasel is a master of adaptation. In the summer, its coat is medium brown to cream, blending in with soil, rocks and plant life. In the winter, it turns white to blend in with the snow. In both phases, there is a black tip on its tail. Photo by Jim Peaco/NPS