Recently I have noticed two small holes (3/4" to1" diameter) in the coop's run. This is an enclosed coop/run combination. I've not actually seen any vermin or signs of them. I lost a hen last week to fowl cholera which can be transmitted by rodents. What is the best way to rid my chickens from these pests. I have noticed some mole activity in the yard this summer. By he way, all the other chickens are fine. Now three hens and one rooster.