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LC
Red-winged Blackbird Agelaius phoeniceus

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 extremely 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)
AOU. 1998. Check-list of North American birds. American Ornithologists' Union, Washington, D.C.

Taxonomic note
Agelaius phoeniceus (Sibley and Monroe 1990, 1993) has been split into A. phoeniceus and A. assimilis following AOU (1998).

Trend justification
This species has undergone a small or statistically insignificant decrease over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).

Related state of the world's birds case studies

References
Bradley, N. L.; Leopold, A. C.; Ross, J.; Huffaker, W. 1999. Phenological changes reflect climate change in Wisconsin. Proceedings of the National Academy of Sciences of the United States of America 96: 9701-9704.

Torti, V. M.; Dunn, P. O. 2005. Variable effects of climate change on six species of North American birds. Oecologia 145: 486-495.

Weatherhead, J. 2005. Effects of climate variation on timing of nesting, reproductive success, and offspring sex ratios of redwinged blackbirds. Oecologia 144: 168-175.

Wilson, W. H. 2007. Spring arrival dates of migratory breeding birds in Maine: sensitivity to climate change. Wilson Journal of Ornithology 119: 665-677.

Further web sources of information
Explore HBW Alive for further information on this species

View photos and videos and hear sounds of this species from the Internet Bird Collection

Text account compilers
Ekstrom, J., Butchart, S.

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

Recommended citation
BirdLife International (2014) Species factsheet: Agelaius phoeniceus. Downloaded from http://www.birdlife.org on 23/08/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 23/08/2014.

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.

Additional resources for this species

ARKive species - Red-winged blackbird (Agelaius phoeniceus) 0

Key facts
Current IUCN Red List category Least Concern
Family Icteridae (New World blackbirds)
Species name author (Linnaeus, 1766)
Population size 210000000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 8,720,000 km2
Country endemic? No
Links to further information
- Additional Information on this species