Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
This species qualifies as Critically Endangered because it has an extremely small population, confined to a tiny area on one island. Although numbers have recently been increasing, a continuing decline is projected owing to the impact of a disease which is probably already causing chick mortality.
100 mature individuals
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 - Afrotropical - realm
Realm - Antarctic - realm
IUCN Ecosystem -- Terrestrial biome
IUCN Ecosystem -- Marine biome