Hired to guard sheep in Yosemite
In June 1869 the sheep owner Pat Delaney hired the 31-year-old John Muir to go with his shepherd Billy and about 2,000 sheep on a summer drive. The flock moved from the Merced and Tuolumne foothills up to Tuolumne Meadows and back by September, with Muir sketching, botanizing and climbing, including creeping out to the brink of Yosemite Falls. The same journal that records his ecstasy records the flock stripping meadows bare, and Muir calls the sheep 'hoofed locusts', an early eyewitness case of commercial grazing degrading high-country ecosystems.