Nitpick, but cats aren’t an “apex” predator in any environment. They are hunted by pretty much every carnivore at least as big as a coyote, including large birds of prey.
They are in New Zealand, where the problem is worse than in Australia. New Zealand has zero native land predators. There are some birds of prey that can hunt invasive stoats and rats, but cats are effectively uncontested (with the exception of humans performing population control).
Nitpick, but cats aren’t an “apex” predator in any environment. They are hunted by pretty much every carnivore at least as big as a coyote, including large birds of prey.
They are in New Zealand, where the problem is worse than in Australia. New Zealand has zero native land predators. There are some birds of prey that can hunt invasive stoats and rats, but cats are effectively uncontested (with the exception of humans performing population control).