I personally appreciate this service project by scouts of Troop 747 out of Tucson, Arizona. The project involved making and installing wildlife escape ramps in livestock water troughs. This lets rodents climb out rather than drowning and rotting in the water.
This is obviously better for livestock using the trough, but hikers that refill their water bottles benefit as well. There's a good chance I might need to use one of these water troughs while I'm hiking the Arizona Trail next spring, so 'Thanks, Scouts!'

See this page.

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