Exploring Alaska: Denali National Park
Tuya, a sled dog, rests in her doghouse after greeting a handful of park guests at Denali National Park, Alaska, Jan. 19, 2015. Denali National Park has nearly 30 sled dogs that patrol much of the park’s 6 million acres throughout the winter; visitors are encouraged to meet the dogs while the dogs are not on patrol. (U.S. Air Force photo by 1st Lt. Elias Zani/Released)