> I am just worried that a couple of eager beavers are going to start dismantling cairn, even ones that are in place for navigation purposes and are legit leadi

> I am just worried that a couple of eager beavers are going to start dismantling cairn, even ones that are in place for navigation purposes and are legit leading to people getting lost and/or dying in the wilderness. Nah. Virtually any 'official' cairn built for navigation isn't going to be mistaken for something done for social media nor pushed over with a quick nudge. The exception is in remote back country, where the only people that would come across it wouldn't be naive to it's legitimacy. I'm not sure about Yosemite, but there are certainly places where it's a bigger issue than Park Rangers alone should have to deal with. A number of places in Hawaii come to mind, see [1]. On trails that see a lot of traffic, a few stacks in a cobble field can multiply almost exponentially. Having worked a good bit in ecotourism, 'Leave No Trace' has no chance if there's evidence for tourists that '[but] no one else was following it' in the form of a few stacks near each other. [1] https://www.hawaiimagazine.com/why-rock-stacking-at-hanakapiai-beach-isnt-considered-pono-right/ https://www.hawaiimagazine.com/why-rock-stacking-at-hanakapi...