New Zealand has no native large land mammals or apex terrestrial predators, which is why its unique flightless bird populations evolved in the absence of traditional defensive mechanisms. However, following human settlement, introduced invasive mammalian species—most notably stoats, ferrets, and feral cats—have become the functional top predators of New Zealand's ecosystems. Stoats and ferrets are aggressive mustelids that prey heavily on native wildlife, particularly ground-nesting birds like the kiwi, posing a severe ecological threat that ongoing national conservation efforts actively work to eradicate.
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