We keep several small water troughs around the yard for wildlife. One is hidden from view of the house so the animals can drink in peace. This is where the deer and other shy creatures drink. When I first set it out, I did not put anything in the trough, then I found a drowned mouse that had fallen in and I felt awful. So I added a series of rocks that stair step up to a large rock that leads out of the pond. it seems to have taken care of that problem. It also gives shelter for the fish we keep in the troughs or adventurous frogs.