Damn things are tearing up my lawn and making it a hazardous place to walk without tripping on their tunnels when they collapse under your foot 
Anyone have any solutions on how to get rid of them?
Or have a clue as to what attracks them to my lawn?
Most of my lawn is heavy clay and most of my grass is simply mowed down field grass. But when we built the house (20 years ago) I brought in a couple truckloads of topsoil and spread it around the front lawn in hopes of getting some decent looking grass to grow. There are ZERO moles infesting any of the areas where there is clay. But in the area where I spread the topsoil I have some sort of little critters tearing up what little nice grass I have.
HELP, advice, suggestions???

Anyone have any solutions on how to get rid of them?
Or have a clue as to what attracks them to my lawn?
Most of my lawn is heavy clay and most of my grass is simply mowed down field grass. But when we built the house (20 years ago) I brought in a couple truckloads of topsoil and spread it around the front lawn in hopes of getting some decent looking grass to grow. There are ZERO moles infesting any of the areas where there is clay. But in the area where I spread the topsoil I have some sort of little critters tearing up what little nice grass I have.
HELP, advice, suggestions???