A lesser evil than introduced feral cats taking out unique ecosystems in AU & NZ.

Killing an intelligent critter by spraying poison on them is evil and inhumane.

And your suggestion for eliminating feral cats is?

Or are you in favour of the death of bilbies, quokkas, quolls, potoroos, et al en masse?

These nice ladies: https://www.youtube.com/watch?v=J7h9V4aKlJw

like to flush ferals out with grass fires and net, spear, or shoot them as they flee and either toss them or take them home to eat.

There are plenty of cats.

Some of our native birds have gone. Some have gone as low as five remaining. Get cats out of New Zealand.

https://en.m.wikipedia.org/wiki/Black_robin