Critters can cause catastrophe in your yard if left unchecked. If you see the tell-tale signs of moles in the form of puffed up mounds and hills in your lawn, you have a problem. Moles feed on grubs and earthworms, and in the process, will wreak havoc on the roots of your grass unless you take action. The only effective way to get rid of moles is to trap them. Then, discourage their return by controlling grubs and cutting back on your watering routine to attract fewer earthworms to your yard.