Ok so I am having s problem with rats and need some suggestions. First off we have 2 cats that live on our property and wild cats that roam around! They don't help. With that being said our rats are not your normal rats. We live in Central America about 40 minutes out from the major city Guatemala City. They rats are about 4 pounds or bigger. They make there holes in and under the coop no matter how much concrete I fill them with. My chickens are free ranged all the time and locked up at night? I have lost around 20 something chicks in the past month, I'm guessing Bc of the cooler weather and with rainy season around the corner. Any ideas of what I can try. In the coop I have 2 ducks, about 50 hens from all breeds 4 roosters, 3 rabbits that we breed that run free in the coop and quail in a hutch also in the coop!