Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
Mainland populations of this species may be in extremely rapid decline, based on probable annual declines caused by introduced species. However, the large Stewart Island population may be stable, and thus the overall decline is likely to be slower, but still rapid, warranting Vulnerable status.
19900 mature individuals
Distribution size (breeding/resident):
Land-mass type - oceanic island - Oceanic islands are islands or island groups that are <200,000 sq km in size and separated from other land masses by >200 m sea depth. Generally Oceanic islands are islands or island groups that are <200,000 sq km in size and separated from other land masses by >200 m sea depth. Generally they have never been connected to a continental area by a land-ridge, and are volcanic in origin.
Realm - Oceanic - realm
IUCN Ecosystem -- Terrestrial biome