[mytailorisrich]

Keep in mind that many of the mammals killed by cats are mice and rats that we want to kill anyway.

I think a bell goes a long way, as already suggested.

[adrienchauvet]

Wild predators already have this job. By raising millions of cats in each countries, the pressure on wild rodents becomes huge. Without talking about wild birds whose populations are plummeting.

[qwytw]

Mice and rats that live in urban and semi-urban areas are not really that more wild than cats. Their populations collapse if they lost access to their food sources which are provided by humans.