Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
Recent analysis of trend data for the global
population over the past three generations (64 years) gives a best case estimate of a 17 % increase and a worst case scenario of a 7.2 % decline (Chown et al 2008 unpubl.report to SCAR);
declines consequently do not approach the threshold for classification as Vulnerable and the species has been downlisted from Near Threatened to Least Concern.
65000-100000 mature individuals
Distribution size (breeding/resident):
Land-mass type - continent - Continents are land masses > bigger than Australia (=7,682,300 sq km).
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.
Land-mass type - shelf island - Continental islands include all other islands or island groups. Generally they were once part of continents and lie on a continental shelf of < 200 m sea depth.
Realm - Afrotropical - realm
Realm - Neotropical - realm
Realm - Oceanic - realm
Realm - Antarctic - realm
IUCN Ecosystem -- Terrestrial biome
IUCN Ecosystem -- Marine biome