Four step plan:
1. purchase a large quantity of the cheapest cat food you can find and four automatic feeders. Set it up and allow the cats to gorge themselves constantly. Keep them fat and lazy.
2. Search this site for a recommendation on a very protective rooster. Find one and press him into service.
3. Build the fence Ivan recommended, but around the cats instead of around the chickens.
4. Be absolutely sure that the colony is not breeding or attracting new members.
Just for my own edification, why would you maintain, let alone bind yourself by contract to maintain, a colony of an invasive species?
1. purchase a large quantity of the cheapest cat food you can find and four automatic feeders. Set it up and allow the cats to gorge themselves constantly. Keep them fat and lazy.
2. Search this site for a recommendation on a very protective rooster. Find one and press him into service.
3. Build the fence Ivan recommended, but around the cats instead of around the chickens.
4. Be absolutely sure that the colony is not breeding or attracting new members.
Just for my own edification, why would you maintain, let alone bind yourself by contract to maintain, a colony of an invasive species?