These stacked stones, or cairns, are often called ducks. Ducks are used to mark backcountry hiking trails, to point hikers in a particular direction. These ducks have been erected near Mirror Lake. As a general rule, ducks should not be erected frivolously, even along backcountry trails. However, some park visitors apparently enjoy leaving their mark on the area, in a way that does not permanently mar the scenery.Galleries:Yosemite National ParkKeywords:cairn, mirror lake, rock ducks, trail markers, yosemite national park, yosemite valleyPhoto Location: Yosemite National Park, CaliforniaPhotographer: Dr. Roy WinkelmanDate of Photo: 07/10/2011Device Make: CanonDevice Model: Canon EOS 5D Mark IIOriginal Dimensions: 3744×5616Picture Orientation: PortraitGPS Coordinates: 37°44'36.00"N 119°34'33.00"WPicture Number: 12881
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