The Ornithological Society published The Field Guide to the Birds of New Zealand, by Heather and Robertson. And there are also checklist books. I didn't count them, but there would be more than a...
Proportionally as many as there are in any other similar country. There is no census done on a person being an "Emo" so no valid statistics to answer your inquiry.
The largest fault is the Alpine Fault running most of the length of the South Island and continuing through the North Island to join up with the Kermadec Trench in the NE of New Zealand. This...