Why do they call the people of new zealand kiwi?

The name derives from the kiwi, a flightless bird, which is native to, and a national symbol of, New Zealand. It was first used by the military since the Regimental Signs for all New Zealand regiments feature the kiwi. although some pakeha (non-Maori) might call themselves kiwi, Maori do not. The use of nicknames based on nationality, ethnicity or culture is discouraged as it may be considered disrespectful, offensive or even racist.