Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
This species qualifies as Vulnerable because the population is restricted to a very small area when breeding, and remains at risk from the accidental introduction of predators and other catastrophes. If it succeeds in expanding its range, it may be downlisted to Near Threatened.
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 - Nearctic - realm
Realm - Neotropical - realm
Realm - Oceanic - realm
Realm - Palearctic - realm
IUCN Ecosystem -- Terrestrial biome
IUCN Ecosystem -- Marine biome