endless iterations

At undergrad, the students were under strict orders not to interfere with the daily doings of the various feral cats about campus, nor were they to adopt them or shoo them away. I don't recall any problems due to mice or rats -- no plague, no rabies, no power outages. If I recall correctly, the people who worked at the Physical Plant left out saucers of milk and pieces of cheese every so often to keep the cats around and mousing.