|Range of E. cyanocephalus |
Euphagus affinis (Shufeldt, 1892)
Adult males have black plumage with an iridescent purple head and neck and glossy bluish-green highlights on the rest of the body. The feet and legs are black and the eye is bright yellow. The female is brownish-grey with slight hints of the male's iridescence. The female's eye is dark brown, while the male's is bright yellow. Overall, they resemble the eastern member of the same genus, the rusty blackbird; the Brewer's blackbird, however, has a shorter bill and the male's head is iridescent purple. This bird is often mistaken for the common grackle but has a shorter tail. The call is a sharp check which is also distinguishable. This bird is in a different family from the Eurasian blackbird.
|length||8–10.3 in (200–260 mm)|
|weight||63 g (2.2 oz)|
|wingspan||15.5 in (390 mm)|
|wing||121–133 mm (4.8–5.2 in)|
|tail||95–102.5 mm (3.74–4.04 in)|
|culmen||20.4–24 mm (0.80–0.94 in)|
|tarsus||29.5–33.5 mm (1.16–1.32 in)|
Their breeding habitat is open and semi-open areas, often near water, across central and western North America. They are also very common in parking lots, and easily acclimate to the presence of people.
These birds are often permanent residents in the west. Other birds migrate to the Southeastern United States and Mexico in Spring. The range of this bird has been expanding east in the Great Lakes region.
They forage in shallow water or in fields, mainly eating seeds and insects, some berries. They sometimes catch insects in flight. They feed in flocks outside of the breeding season, sometimes with other blackbirds. In marshy areas, they are known to stand on aquatic plants and wade in shallow water to catch insects. Some have even been known to eat smaller mammals, amphibians, and the nestlings of other birds.
Nests are not built in isolation, but in colonies of up to 30 pairs. Pairs prefer to nest in areas that are around 20-40' in treetops. However, colonies that live near water may also nest in reeds and other freshwater plants. Nests are made from nearby material such as reeds, sticks and hair. They are built by the female in a cup-like shape and are bonded with mud or other securing substances. The color of the nest usually matches the coloration of the eggs and the surrounding environment as it is crucial to survival.
The Brewer's blackbird (Euphagus cyanocephalus) is protected in the United States under the Migratory Bird Treaty Act of 1918, however exceptions are granted under 50 CFR part 21 (2014)  for animals committing or about to commit depredations upon ornamental or shade trees, agricultural crops, livestock, or wildlife, or when concentrated in such numbers and manner that they are a health hazard or other nuisance.
Brewer's blackbird calling
- BirdLife International (2016). "Euphagus cyanocephalus". IUCN Red List of Threatened Species. 2016: e.T22724332A94861418. doi:10.2305/IUCN.UK.2016-3.RLTS.T22724332A94861418.en. Retrieved 13 November 2021.
- Peterson, Roger Tory; Peterson, Virginia Marie (2002). Birds of Eastern and Central North America (5th ed.). New York, NY: Houghton Mifflin. p. 310. ISBN 0-395-74047-9.
- Godfrey, W. Earl (1966). The Birds of Canada. Ottawa: National Museum of Canada. p. 359.
- Sibley, David Allen (2000). The Sibley Guide to Birds. New York: Knopf. p. 514. ISBN 0-679-45122-6.
- "Brewer's Blackbird". Audubon. 13 November 2014. Retrieved 23 October 2022.
- Stepney, P.H.R.; Power, Dennis M. (December 1973). "Analysis of the Eastward Breeding Expansion of Brewer's Blackbird Plus General Aspects of Avian Expansions" (PDF). The Wilson Bulletin. 85 (4): 452–464.
- "Brewer's Blackbird Life History, All About Birds, Cornell Lab of Ornithology". www.allaboutbirds.org. Retrieved 23 October 2022.
- Balph, Martha Hatch (1975). "Development of Young Brewer's Blackbirds". The Wilson Bulletin. 87 (2): 207–230. ISSN 0043-5643.
- Westmoreland, David; A. Kiltie, Richard (November 2007). "Egg coloration and selection for crypsis in open-nesting blackbirds". Journal of Avian Biology. 38 (6): 682–689. doi:10.1111/j.2007.0908-8857.04066.x.
- "List of Migratory Bird Species Protected by the Migratory Bird Treaty Act as of December 2, 2013". US Fish & Wildlife Service.
- "Migratory Bird Permits; Removal of Yellow-billed Magpie and Other Revisions to Depredation Order" (PDF). Federal Register. 79 (214): 65595–65602. Archived from the original (PDF) on 18 July 2017. Retrieved 17 May 2018.
- "Brewer's Blackbird". All About Birds. Cornell Lab of Ornithology.
- "Brewer's Blackbird Euphagus cyanocephalus". Eastern Ecological Science Center. USGS.
- BirdLife species factsheet for Euphagus cyanocephalus
- "Brewer's blackbird media". Internet Bird Collection.
- Brewer's blackbird photo gallery at VIREO (Drexel University)
- Audio recordings of Brewer's blackbird on Xeno-canto.