Hi, Can you describe what they are doing to your yard? The reason I ask is that moles generally do not appear in great numbers, and often appear singly since they are not social creatures. So, I'm wondering if you have moles or maybe something else such as voles or ground squirrels. Describe the problem so we can help identify what critter you have. Also, know that if you have a mole it can tunnel all over your yard, which might make it look like you have a lot of them, but one mole can make a lot of tunnels.