It’s mostly where their water is…they live to drill holes in the ground, turning your yard into a mud pit. They also poop a lot (runny poop) but that doesn’t bother me, though it does my family. They still might dig up your yard even if they don’t have water but it’s less likely. Mine love their water and spend 75% of the day in it. I made a fenced off area within the yard where they can dig it up as much as they like and I can sit on the outside and watch their antics (I also have a pond on my property so the fenced area is a necessity).