New Zealand has a lot of introduced animals. Some were brought here for hunting, like rabbits and deer; some were brought for often-misguided attempts at pest control, like the little birds and ferrets; some were brought for nostalgic reasons, like swans; and some were brought for no good reason at all, like wallabies and frogs. Most of the introduced species are now pests to varying degrees, from the possums that munch their way through an estimated 20,000 tonnes of vegetation every night, to the stoats that kill up to 95% of kiwi chicks every year. But some are to all intents
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