Neozealandia is a biogeographic province of the Antarctic Realm according to the classification developed by Miklos Udvardy in 1975.
The southernmost areas of Neozealandia overlap with the Insulantarctica province, which includes the New Zealand Subantarctic Islands.
Due to isolation, the entire Zealandia archipelago has remained virtually free of mammals (except for bats and a few others) and invasive alien species.
Also, New Zealand has vestiges of ancient temperate rain forests with plant species, such as giant club mosses, tree ferns and Nothofagus trees, dating from the time when the Zealandia subcontinent split off from Gondwana.
New Zealand grasslands are dominated by vast spreadings of tussock grass fed upon by the native ground parrots.