Ferruginous hawk

Ferruginous hawk
Name	Ferruginous hawk
Genus	Buteo
Species	regalis
Authority	(Gmelin, 1788)

Ferruginous hawk is a large North American raptor noted for its reddish-brown plumage, broad wings, and preference for open country. The species is associated with grasslands and shrublands across the Great Plains and intermountain West, and it figures in conservation efforts involving The Nature Conservancy, National Audubon Society, and United States Fish and Wildlife Service. Ornithologists, ecologists, and wildlife managers from institutions such as Smithsonian Institution, University of California, Berkeley, Cornell Lab of Ornithology, and U.S. Geological Survey have documented its natural history and population trends.

Taxonomy and Systematics

Described formally in the 18th century by Johann Friedrich Gmelin, the species sits in the genus Buteo, a taxon studied by researchers at American Ornithological Society, British Ornithologists' Club, and historical authorities like Carl Linnaeus. Systematic treatments reference collections at the Natural History Museum, London, Field Museum of Natural History, and Muséum national d'Histoire naturelle. Molecular studies using methods developed in laboratories at Harvard University, University of Oxford, and University of California, Davis compare mitochondrial DNA among Buteo jamaicensis, Buteo lagopus, and related taxa. Taxonomic debates have been addressed in journals such as The Auk, Journal of Avian Biology, and Condor with contributions from researchers affiliated with BirdLife International and International Union for Conservation of Nature assessments.

Description

Adults display a range of plumage morphs that were cataloged by field workers from Rocky Mountain Bird Observatory and Manomet Center for Conservation Sciences. Standard references like Peterson Field Guide to Birds and monographs published by Cornell Lab of Ornithology provide measurements for wing chord, tail length, and body mass compared across specimens in the collections of Denver Museum of Nature & Science and Canadian Museum of Nature. Traits such as a pale rump, rust-colored back, and heavily feathered tarsi are described in handbooks produced by National Geographic Society and field keys used by staff from Montana Fish, Wildlife & Parks and Alberta Environment and Parks. Identification guides used by members of American Birding Association and contributors to eBird highlight comparisons with Red-tailed Hawk, Rough-legged Hawk, and Swainson's Hawk.

Distribution and Habitat

Breeding range maps assembled by researchers at U.S. Fish and Wildlife Service, Environment and Climate Change Canada, and Bird Studies Canada show concentrations across the Great Plains, Rocky Mountains foothills, and intermontane basins. Wintering grounds extend to Sonoran Desert, Chihuahuan Desert, and agricultural landscapes documented by teams from University of Arizona, Texas A&M University, and New Mexico Department of Game and Fish. Habitat studies by National Park Service ecologists and Bureau of Land Management biologists emphasize associations with native prairie, sagebrush steppe, and mixed-grass prairies, locations managed under programs by U.S. Department of Agriculture and conservation easements supported by Ducks Unlimited.

Behavior and Ecology

Field research conducted by scientists affiliated with University of Wyoming, Colorado State University, and University of Montana describes territoriality, perch use, and seasonal movements. Studies in behavioral ecology published in Ecology and Journal of Wildlife Management analyze nesting site selection near native prairie remnants protected by American Prairie Reserve and monitored by personnel from Montana Audubon. Interactions with species such as Prairie Dog, Black-tailed Prairie Dog, and Lark Bunting are reported in community ecology surveys led by researchers at Kansas State University and Oklahoma State University.

Diet and Hunting

Dietary analyses by researchers at Oregon State University and Iowa State University indicate a reliance on mammals including ground squirrels, cottontail rabbits, and jackrabbits, with regional studies documenting predation on prairie dogs and small rodents. Hunting techniques—hovering, soaring, and perch-hunting—are compared with methods described for Red-tailed Hawk in field studies from University of Nebraska-Lincoln and Texas Tech University. Stable isotope analysis and pellet studies published in Journal of Raptor Research involve collaborators from Montana State University and Simon Fraser University.

Reproduction and Lifespan

Nesting ecology research by personnel from Wyoming Game and Fish Department, Intermountain Bird Observatory, and University of Saskatchewan documents clutch size, incubation behavior, and fledging success. Long-term monitoring at sites managed by Prairie Wildlife Research Institute and land trusts like Chicago Wilderness contributes to survival estimates and age-structured demographic models used by analysts at U.S. Fish and Wildlife Service and NatureServe. Banding programs coordinated with Canadian Wildlife Service and USGS Bird Banding Laboratory provide longevity records and migration data.

Conservation and Threats

Conservation status assessments by IUCN, U.S. Fish and Wildlife Service, and provincial agencies such as Alberta Environment and Parks and Saskatchewan Ministry of Environment cite habitat loss from conversion to agriculture, energy development documented by Bureau of Land Management and Department of Energy, and declines in prey populations like prairie dogs linked to plague management policies by Centers for Disease Control and Prevention. Recovery and management initiatives are undertaken by groups including The Nature Conservancy, National Audubon Society, Raptor Research Foundation, and local landowners working with USDA Natural Resources Conservation Service. Conservation literature in Biological Conservation and action plans developed with Migratory Bird Treaty Act considerations inform adaptive management implemented by state wildlife agencies.

Category:Birds of North America