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LC
Little Shearwater Puffinus assimilis

Justification
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 is very large, and hence does not 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.

Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: http://www.aerc.eu/DOCS/Bird_taxa_of _the_WP15.xls.
AOU. 1998. Check-list of North American birds. American Ornithologists' Union, Washington, D.C.
Brooke, M. De L. 2004. Albatrosses and petrels across the world. Oxford University Press, Oxford.
Christidis, L.; Boles, W. E. 1994. The taxonomy and species of birds of Australia and its territories. Royal Australasian Ornithologists' Union, Melbourne.
Christidis, L.; Boles, W. E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.
Cramp, S.; Perrins, C. M. 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. Oxford University Press, Oxford.
Dowsett, R. J.; Forbes-Watson, A. D. 1993. Checklist of birds of the Afrotropical and Malagasy regions. Tauraco Press, Li
SACC. 2006. A classification of the bird species of South America. Available at: http://www.museum.lsu.edu/~Remsen/SACCBaseline.html.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.
Stotz, D. F.; Fitzpatrick, J. W.; Parker, T. A.; Moskovits, D. K. 1996. Neotropical birds: ecology and conservation. University of Chicago Press, Chicago.
Turbott, E. G. 1990. Checklist of the birds of New Zealand. Ornithological Society of New Zealand, Wellington.

Taxonomic note
Puffinus lherminieri (Sibley and Monroe 1990, 1993) was split into P. lherminieri and P. baroli by Sangster et al. (2005) but this treatment is not followed by the BirdLife Taxonomic Working Group, because the molecular study cited as justification for the separation of baroli from lherminieri (Austin et al. 2004) does not make such a claim, indicating only that baroli is a diagnosable subspecies of P. lherminieri. (P. baroli is currently treated as a subspecies of P. assimilis following Brooke 2004).

Distribution and population
The Little Shearwater is found throughout the oceans of the Southern Hemisphere south of the Tropic of Capricorn, with the exception of the south-east coast of South America. It is also found of the north-west coast of Africa, breeding on Cape Verde, the Azores, Portugal and the Canary Islands, Spain1.

Population justification
Brooke (2004) estimated the global population to number over 900,000 individuals.

Trend justification
The population is suspected to be in decline owing to predation by invasive species.

Ecology
This marine species is found over warm tropical and subtropical waters, more frequently on inshore wanters then pelagic. Squid, fish and crustaceans have all been recorded in its diet. It breeds mostly during the local summer in colonies on offshore or oceanic islands, on grassy slopes or amongst rocks up to 15 km inland. Most populations are considered fairly sedentary with some dispersal (mainly immature individuals) (del Hoyo et al. 1992)

References
Brooke, M. De L. 2004. Albatrosses and petrels across the world. Oxford University Press, Oxford.

del Hoyo, J.; Elliot, A.; Sargatal, J. 1992. Handbook of the Birds of the World, vol. 1: Ostrich to Ducks. Lynx Edicions, Barcelona, Spain.

Further web sources of information
Detailed species account from Birds in Europe: population estimates, trends and conservation status (BirdLife International 2004)

Text account compilers
Ekstrom, J., Butchart, S., Newton, P., Calvert, R.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2014) Species factsheet: Puffinus assimilis. Downloaded from http://www.birdlife.org on 17/04/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/04/2014.

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.

Key facts
Current IUCN Red List category Least Concern
Family Procellariidae (Petrels and shearwaters)
Species name author Gould, 1838
Population size mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 58,500,000 km2
Country endemic? No
Links to further information
- Additional Information on this species