This fence at the Karori Wildlife Sanctuary in suburban Wellington was built to keep out predators such as possums and rats. One of the major reasons that New Zealand’s native animal life forms are threatened is that for millions of years they lived in the absence of mammalian predators, so they have no evolved defences. Conservationists have long recognised that these species thrive on islands where predators are absent. This idea has been adapted on mainland sites such as Karori where a chosen area is fenced, the predators within are wiped out, and endangered native species are re-introduced.
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Photograph by Christina Troup
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