This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size may be moderately small to large, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.html#.
The BirdLife Taxonomic Working Group is aware that phylogenetic analyses have been published which have proposed generic rearrangements which may affect this species, but prefers to wait until work by other taxonomists reveals how these changes affect the
Antas, P. T. Z. 1991. Status and conservation of seabirds breeding in Brazilian waters. In: Croxall, J.P. (ed.), Seabird status and conservation: a supplement, pp. 141-158. International Council for Bird Preservation, Cambridge, U.K.
Clements, J. F.; Shany, N. 2001. A field guide to the birds of Peru. Lynx Edicions, Barcelona, Spain.
del Hoyo, J.; Elliott, A.; Sargatal, J. 1996. Handbook of the Birds of the World, vol. 3: Hoatzin to Auks. Lynx Edicions, Barcelona, Spain.
Delany, S.; Scott, D. 2006. Waterbird population estimates. Wetlands International, Wageningen, The Netherlands.
Duffy, D. C.; Hays, C.; Plenge, M. A. 1984. The conservation status of Peruvian seabirds. In: Croxall, J.P.; Evans, P.G.H.; Schreiber, R.W. (ed.), Status and conservation of the world's seabirds, pp. 245-259. International Council for Bird Preservation, Cambridge, UK.
Schlatter, R. P. 1984. The status and conservation of seabirds in Chile. In: Croxall, J.P.; Evans, P.G.H.; Schreiber, R.W. (ed.), Status and conservation of the world's seabirds, pp. 261-269. International Council for Bird Preservation, Cambridge, U.K.
Woods, R. W. 1988. Guide to birds of the Falkland Islands. Anthony Nelson, Oswestry, U.K.
Woods, R. W.; Woods, A. 1997. Atlas of breeding birds of the Falkland Islands. Anthony Nelson, Oswestry, U.K.
Further web sources of information
Explore HBW Alive for further information on this species
Text account compilers
Ekstrom, J., Butchart, S., Malpas, L., Calvert, R.
IUCN Red List evaluators
Butchart, S., Symes, A.
BirdLife International (2016) Species factsheet: Sterna hirundinacea. Downloaded from http://www.birdlife.org on 26/07/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 26/07/2016.
This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.
To provide new information to update this factsheet or to correct any errors, please email BirdLife
To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.
Additional resources for this species
|Current IUCN Red List category||Least Concern|
|Family||Laridae (Gulls, Terns, Skimmers)|
|Species name author||Lesson, 1831|
|Population size||mature individuals|
|Distribution size (breeding/resident)||1,410,000 km2|
|Links to further information|
|- Additional Information on this species|