Why are there so many mice in London?

This position attributes London's abundance of mice to rodenticide resistance. It argues that the sheer scale of the city's mouse problem has driven extended, heavy use of poisons — and that London's mice have, in turn, evolved resistance to the rodenticides meant to control them.

This position attributes London's abundance of mice simply to the city's size. It argues that because London is far larger than most European cities, it offers more living space and habitat for mice — so a bigger city naturally supports a bigger mouse population.

This position holds that London's architecture is why the city has so many mice. It argues that the materials used in London's old buildings make them harder to seal against rodents than newer European cities, giving mice easy access into homes and businesses.

This position attributes London's abundance of mice to its predator ecosystem. It argues that the city strips away many of the survival threats mice face in the wild — with far fewer predators and a plentiful supply of food, urban mice thrive and multiply.

Seeing bags overflowing with rubbish is a common site on London streets. Other European cites have more sanitary waste management systems, limiting mice's food supplies.