Motor vehicles are prohibited in Denali National Park in Alaska, except for buses that shuttle visitors through a limited area. Rangers patrol on foot, horseback, in helicopters, or with dogsleds. For more than 100 years, Denali has raised sled dog puppies in their own breeding program in conjunction with reputable Alaskan breeders. On March 30, sled dog Spark gave birth to six puppies in the park. Some of these will be swapped with other litters from breeders, and four that show the best qua...

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