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Llamas offer a low-impact alternative to pack-horses and mules.
near Pelican Lake, Point Reyes NS, CA (1987).
For many years the Sierra Club ran high-country trips with burros as pack animals.
near Isberg Pass, Yosemite NP, CA (1986).
Professional wilderness packers use strings of mules led by a wrangler on horseback.
near Reds Meadow, Sierra NF, CA (1977) Photograph by Hugh P. Bain..