A severe mouse plague is overwhelming towns north-east of Perth, with residents describing roads covered in mice and infestations in homes and businesses.
Locals and farmers say current baits are ineffective and are calling for urgent approval to use stronger rodent poisons — a bureaucratic process that is dragging on.
The local MP says in the meantime, people are leaving town.
Unfortunately poisoning this many mice in such a wide area will undoubtedly lead to wider ecosystem casualties to creatures who feed on live mice and carion.
This can be mitigated by using poisons that break down while doing their job and are only effective at specific dosage to bodyweight such that they naturally dillute while killing mice, but since the mice will eat each other that also means they will build resistance to it very quickly.
The most ideal solution would be a mass sterilization, such as catching and spaying almost all the females, castrating the males, causing them to outcompete themselves for food and shrink dramatically in population.
Barring that, a better solution to poison is to trick them into falling into a container, this works well with buckets and then they can be sorted and disposed of later.
I don’t see how TNR is viable when a town is overrun with mice. You’re talking about hundreds of thousands of “surgeries” on animals that have fleeting life spans. And these mice infestations are tens of millions of animals. I did hysterectomies on lab rats during college so I know that it’s not a very long process, but a rat is also 4x bigger than a mouse and it seems needlessly cruel to put an invasive pest animal through a traumatic surgery for essentially no gain.