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We’ve seen how New Zealand was untouched by humans for millions of years, but tonight’s final part of this stunning series about the island chain’s amazing landscape and wildlife tells the story of what happened when European settlers began to arrive. It reveals how they created a home from home by bringing animals and plants with them, which is why the country is home to non-indigenous hedgehogs, blackbirds and, of course, sheep. We also find out why many of these new arrivals had a negative impact on native species, including the rare kakapo.