Red-shouldered Hawk

Red-shouldered Hawk
Name	Red-shouldered Hawk
Status	LC
Status system	IUCN3.1
Genus	Buteo
Species	lineatus
Authority	(Gmelin, 1788)

Red-shouldered Hawk The Red-shouldered Hawk is a medium-sized raptor native to North America, noted for its distinctive rufous underparts and barred tail. Found in deciduous and mixed woodlands, it is a territorial species whose vocalizations, hunting behavior, and nest-building have been documented across ornithological literature. Naturalists and institutions have long studied its ecology, migration, and population trends.

Taxonomy and Systematics

The species was described in the late 18th century and is placed in the genus Buteo, a group that includes species discussed by early taxonomists in the context of works by Carl Linnaeus, Johann Friedrich Gmelin, and later avian systematists associated with the American Ornithological Society. Molecular phylogenetics using mitochondrial DNA and nuclear markers—techniques utilized in studies at institutions like the Smithsonian Institution, American Museum of Natural History, and universities such as Harvard University and Cornell University—have clarified relationships among Buteo taxa, revealing affinities with species often compared in field guides published by the Audubon Society and the Royal Ontario Museum. Historical museum collections at the Natural History Museum, London and the Field Museum contribute type specimens and comparative material. Systematic treatments appear in monographs by ornithologists associated with the British Ornithologists' Union and regional checklists compiled by the North American Bird Conservation Initiative.

Description

Adult plumage exhibits rufous barring on the chest and underparts, with a black-and-white checkered wing pattern comparable to descriptions in field guides by authors from the National Geographic Society, Princeton University Press, and the Lynx Edicions series. Vocalizations have been analyzed in publications from the Cornell Lab of Ornithology, where sonograms and calls are catalogued alongside recordings of raptors like the Red-tailed Hawk and the Cooper's Hawk. Morphometrics collected by researchers affiliated with University of California, Berkeley and the University of Florida include wing chord, tail length, and bill dimensions used to differentiate subspecies recognized in regional floras and faunal surveys such as those produced by the United States Fish and Wildlife Service and the Canadian Wildlife Service. Color plates by illustrators linked to institutions like the Royal Society for the Protection of Birds and photographers from publications such as National Geographic provide diagnostic comparisons with similar species noted in guides by Roger Tory Peterson and David Sibley.

Distribution and Habitat

The species breeds in eastern North America and isolated populations occur in parts of the western United States, with range maps produced by the Breeding Bird Survey and distribution analyses by the Partners in Flight initiative. Breeding locales are documented in state and provincial atlases maintained by agencies such as the California Department of Fish and Wildlife, Florida Fish and Wildlife Conservation Commission, and the Ontario Ministry of Natural Resources and Forestry. Migratory movements have been tracked by banding stations coordinated by the United States Geological Survey and the Canadian Migration Monitoring Network, and by telemetry projects often hosted by universities like University of Missouri and University of Arizona. Habitats include riparian corridors in areas monitored by the Environmental Protection Agency, bottomland hardwood forests conserved by organizations such as the Nature Conservancy, and suburban woodlots surveyed in studies funded by the National Science Foundation.

Behavior and Ecology

Foraging strategies include perch-hunting and low flight through canopy gaps, behaviors described in ecological studies published in journals affiliated with the Ecological Society of America and researchers from the Yale School of the Environment. Diet analyses conducted by teams at the Ohio State University and the University of Georgia report amphibians, small mammals, reptiles, and large insects, comparable to prey lists in regional faunal accounts by the Missouri Department of Conservation and the Georgia Department of Natural Resources. Interactions with other raptors—competition with species reported in literature from the Raptor Research Foundation—and predator-prey dynamics involving species monitored by the United States Forest Service and the National Park Service have been examined in multi-institution collaborations. Vocal behavior and territory defense have been the subject of behavioral ecology research supported by the British Ecological Society and North American bird observatories.

Reproduction and Lifespan

Nest construction in tall trees over water or floodplain systems is reported in breeding studies conducted by the National Audubon Society, with nest-site fidelity and clutch parameters documented in long-term monitoring by the North American Breeding Bird Survey and banding studies coordinated by the Bird Banding Laboratory. Life-history parameters, including age at first breeding and annual survival rates, have been estimated in demographic studies by researchers affiliated with the University of Michigan and the University of Illinois. Histories of nest success and fledging have been summarized in regional conservation plans by agencies like the California Department of Fish and Wildlife and the Florida Natural Areas Inventory.

Conservation and Threats

The Red-shouldered Hawk is listed as Least Concern by global assessments compiled by organizations such as the International Union for Conservation of Nature and monitoring programs run by the North American Bird Conservation Initiative. Nonetheless, habitat loss from development projects overseen by municipal governments, wetland drainage historically regulated under laws like the Migratory Bird Treaty Act and contemporary land-use changes tracked by the United States Census Bureau affect local populations. Conservation measures promoted by NGOs including the Sierra Club, World Wildlife Fund, and the National Audubon Society emphasize riparian habitat protection and nest-site preservation; research funding and policy recommendations have been produced in partnership with agencies such as the U.S. Fish and Wildlife Service and state conservation departments. Citizen science contributions via platforms operated by the Cornell Lab of Ornithology and the Royal Society for the Protection of Birds continue to inform population trends and management actions.

Category:Birds of North America