There were two concentration camp outposts on the site. And as the building supervisor he was responsible for the deployment of personnel. The more complex and densely populated a human settlement, the happier rats feel which is why New York is their world capital. Town rats have become far larger over the years than country rats. They are stronger, more fertile and more versatile.
Rats test their food.
When a rat dies, the other rats avoid the bait. They avoid places where traps are set up. They use a town s infrastructure as though it had been made just for them. The more networked the city, the more mobile the rats. According to pest controllers, the rats know the subway maps better than the rail workers themselves.