Stacks of rocks along a trail are called cairns, ducks or duckies. A cairn is usually a man-made stack of rocks used as a trail marker on trails that are easy to get turned around on. Cairns may not be directly on a trail but ensure that a trail is close by. Ducks or duckies are man-made stacks of rocks that have a pointed rock within them that point the trail direction. Following cairns, ducks and duckies is difficult because you must find another cairn in the same sequence in order to use them as a guide. These stacks are easily knocked down in wind and covered over by snow. It is the responsibility of knowledgeable hikers to maintain the cairns along the trail.
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