Europeans have drastically altered the landscape of NZ. This was starkly shown to me as a tourist when our flight from Aus. gave us a high-level view of Egmont park around Mt. Taranaki. From the air, it looks just like the map[1]. The circular area of the park is dark green, the sheep lands outside are pale green. Early in the 20th century they used large mechanized "brush cutters" to clear the native scrub to make grazing lands.

[1] https://goo.gl/maps/Df2sSMewsw42