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New Zealand has not been spared the impact of human settlement. Most islands and archipelagos have been altered greatly by humans, agriculture, domestic animals, pets, and loss of habitat. Many island birds were ground-nesters and easy prey for people, dogs, cats, stoats, mongooses, and changing vegetation. New Zealand has had a huge commitment to regaining some of the original nature of the islands. This work has been underway for many years and there is a new energy (and new money) in these sorts of projects right now.
Tiritiri is one of the earliest islands to have invaders removed and natural plants and animals returned; it has taken decades. The animals on NZ are basically birds; there were essentially no mammals before humans arrived. The small bats that were on the islands were very specialized to a predator-free island life and they suffered also. Here are a few of the original birds of New Zealand as they now appear on Tiritiri.