Doesn’t Paris have an annual rat culling since their population of rats is like 10mil? And London is almost as bad as New York (which is also mostly stonework).

Doesn’t Paris have an annual rat culling since their population of rats is like 10mil? And London is almost as bad as New York (which is also mostly stonework). The material hardly matters for rodents, as stone will make its own holes over time for them to get into, and the sewers in Europe are even older and in parts less maintained than the US.