common grackle
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| common grackle | |
|---|---|
 | |
| Name | Common grackle |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Quiscalus |
| Species | quiscula |
| Authority | (Linnaeus, 1758) |
common grackle
The common grackle is a large icterid passerine native to North America, noted for its iridescent plumage and long tail. It occupies diverse habitats from temperate wetlands to urban areas and has been the subject of ornithological study, wildlife management, and cultural references in literature and art.
Taxonomy and Systematics
The species was described by Carl Linnaeus in the 1758 edition of Systema Naturae and is placed in the genus Quiscalus, established by Ludwig Reichenbach. Taxonomic treatments have debated relationships among icterids such as the boat-tailed grackle, great-tailed grackle, and rusty blackbird, with molecular phylogenetic analyses by teams associated with institutions like the Smithsonian Institution and the American Museum of Natural History clarifying affinities. Historical ornithologists including John James Audubon, Alexander Wilson, and Thomas Nuttall contributed to early descriptions and range accounts. Conservation assessments refer to criteria set by the International Union for Conservation of Nature and legislation such as the Migratory Bird Treaty Act for management considerations.
Description
Adults exhibit glossy black plumage with purplish or bronze iridescence, a long keel-shaped tail, and a stout bill; sexual dimorphism is present, with males larger than females. Measurements cited in field guides from the Cornell Lab of Ornithology, the Royal Ontario Museum, and the British Trust for Ornithology place length around 28–34 cm and wingspan near 36–46 cm. Vocalizations include a variety of calls and songs documented in works by Roger Tory Peterson and recordings archived by the Macaulay Library. Juveniles are browner with streaking, as illustrated in plates by John Gould and later illustrated in the National Audubon Society field guides.
Distribution and Habitat
The species breeds across much of the eastern and midwestern United States, southeastern Canada, and migrates through and winters in parts of the southern United States and northern Mexico. Range maps used by agencies such as the U.S. Fish and Wildlife Service and provincial wildlife ministries show expansion into suburban and agricultural landscapes. Habitats include open woodlands, marsh edges, fields, parks, and urban plazas; studies by universities including University of California, University of Michigan, and University of Toronto examine habitat use. Historical range changes have been discussed in relation to 19th-century land use and railroad expansion documented by historians referencing the Transcontinental Railroad era.
Behavior and Ecology
Common grackles form large flocks that can include mixed-species assemblages with starlings and blackbirds, prompting behavioral ecology studies at institutions like Yale University and University of British Columbia. They exhibit communal roosting in winter, sometimes numbering in the thousands, which has been investigated by researchers associated with the National Audubon Society and municipal wildlife departments. Predation pressures from red-tailed hawk and Cooper's hawk have been reported in raptor studies, while brood parasitism by species such as the brown-headed cowbird influences nesting success metrics tracked by the North American Breeding Bird Survey. Migratory connectivity has been examined using banding programs coordinated by the U.S. Geological Survey Bird Banding Laboratory.
Diet and Foraging
Omnivorous and opportunistic, the species consumes invertebrates, seeds, fruits, and anthropogenic food; dietary analyses have been published by researchers affiliated with the Ecological Society of America and the Journal of Field Ornithology. Foraging strategies include ground probing in lawns, gleaning in wetlands, and raiding agricultural fields—a behavior noted in reports from the U.S. Department of Agriculture and state extension services such as Penn State Extension. Seasonal shifts in diet, including increased grain consumption during winter, have implications for interactions with farming communities and have been the subject of studies by the National Academy of Sciences panels on wildlife-agriculture interfaces.
Reproduction and Life Cycle
Breeding typically occurs from late spring through summer, with nests placed in trees, shrubs, or cavities; nest descriptions appear in monographs by the British Ornithologists' Union and the American Ornithologists' Union. Clutch size commonly ranges from three to six eggs; incubation and fledging periods have been recorded in longitudinal studies by researchers at the University of Wisconsin–Madison and the Cornell Lab of Ornithology. Parental care exhibits biparental feeding, and juvenile survival rates have been estimated in demographics research funded by agencies such as the Environment and Climate Change Canada and state wildlife agencies. Parasites and pathogens investigated include ectoparasites detailed in veterinary studies from the Centers for Disease Control and Prevention and avian disease surveillance by the U.S. Geological Survey.
Conservation and Human Interactions
Currently categorized as Least Concern by the IUCN Red List yet subject to local declines and conflicts, the species interacts with humans through agriculture, urban nuisance issues, and wildlife viewing. Management responses range from nonlethal deterrents promoted by the National Wildlife Federation to control measures guided by the U.S. Department of Agriculture Wildlife Services. Cultural references appear in literature and music discussed in analyses at institutions like the Library of Congress and the New York Public Library. Ongoing monitoring is conducted through citizen science platforms such as eBird and coordinated surveys like the Christmas Bird Count, supported by organizations including the National Audubon Society and regional conservation NGOs.