Family: Anatidae (Ducks, Geese, Swans)

Authority: (Vigors, 1834)

Red List Category

Criteria: B2ab(ii,iii,iv,v); C2a(i)

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Justification of Red List category
Although this species's population has grown and continues to increase as a result of extensive conservation actions, it is reliant on ongoing predator control and habitat management measures, without which it would likely quickly decline again. It has a small area of occupancy and occurs at a small number of locations. Its population size remains small and is composed of small subpopulations. In the absence of continued habitat management and/or predator controls, its area of occupancy, area and quality of habitat, and population size would all likely decline. For these reasons, the species is listed as Near Threatened.

Population size: 1700-2200 mature individuals

Population trend: increasing

Extent of occurrence (breeding/resident): 50,700 km²

Country endemic: yes

Attributes
Land-mass type - oceanic island
Realm - Oceanic
IUCN Ecosystem -- Terrestrial biome