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| Caracara plancus | |
|---|---|
| Name | Southern caracara |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Caracara |
| Species | plancus |
| Authority | (Miller, 1777) |
Caracara plancus is a medium-large bird of prey native to South America and parts of Central America, commonly known as the southern caracara. It is recognizable by its long legs, bare facial skin, and opportunistic feeding habits, and is often encountered in open and semi-open landscapes from lowlands to temperate regions.
Described in the 18th century amid taxonomic efforts by figures such as Carl Linnaeus, the species was later treated within raptor taxonomy alongside genera represented in works by John James Audubon and Alexander von Humboldt. Its placement has been debated in the context of classifications used by institutions like the American Ornithological Society, the International Ornithologists' Union, and the British Ornithologists' Union. Molecular studies involving laboratories at universities such as University of Cambridge, Harvard University, and University of São Paulo compared mitochondrial and nuclear sequences to clarify relationships with other Falconidae genera discussed by researchers at the Smithsonian Institution and the Natural History Museum, London. Historical nomenclature appears in catalogues from the Royal Society and expedition records associated with the Viceroyalty of the Río de la Plata and collections of the Muséum National d'Histoire Naturelle.
Adults show a combination of morphological traits documented in field guides produced by the Royal Society for the Protection of Birds, the National Audubon Society, and the Cornell Lab of Ornithology. Plumage varies geographically, with descriptions in regional accounts from the Patagonia National Park area and atlases used by the Brazilian Ornithological Records Committee. Distinguishing features include a hooked bill referenced in comparative works at the Field Museum of Natural History, yellow legs noted in the observational records of the Linnean Society of London, and facial skin coloration recorded by photographers affiliated with the World Wildlife Fund and the BBC Natural History Unit. Measurements and morphometrics appear in monographs curated by the American Museum of Natural History and studies published by the Royal Ontario Museum.
Range maps published by the IUCN Red List and regional conservation bodies indicate presence from northern Chile and Argentina through Uruguay, Paraguay, Bolivia, and Brazil into parts of Colombia and Venezuela, with occasional records in Panama and Costa Rica. Habitat associations have been described in ecological surveys by the University of Buenos Aires, the Pontifical Catholic University of Chile, and governmental agencies such as the Instituto Nacional de Pesquisas Espaciais and the Servicio Nacional de Áreas Naturales Protegidas. The species occupies grasslands, pampas, agricultural mosaics documented in studies sponsored by the Food and Agriculture Organization and rangeland research from the International Livestock Research Institute.
Behavioral ecology has been examined in field studies conducted by researchers linked to the Max Planck Institute for Ornithology, the Smithsonian Tropical Research Institute, and the University of Oxford. Social interactions and territoriality are described in surveys analogous to those from the British Trust for Ornithology. Seasonal movements and local dispersal patterns appear in banding records coordinated by networks including the North American Bird Banding Laboratory and regional stations such as the Centro de Investigaciones en Recursos Naturales. Vocalizations and calls have been archived by the Macaulay Library and analyzed by teams at the University of California, Berkeley.
Foraging behavior is opportunistic and has been documented by ecologists affiliated with the Brazilian Academy of Sciences, the Pontifical Xavierian University, and conservation NGOs such as BirdLife International. Diet includes carrion, invertebrates, and small vertebrates observed in studies published in journals associated with the Royal Society Publishing and field reports by the Wildlife Conservation Society. Feeding interactions in agricultural landscapes are reported by organizations like the Inter-American Development Bank in rural development assessments, and pest control implications are discussed in extension literature from the University of Florida and the Embrapa network.
Breeding phenology and nesting ecology have been explored in theses and articles emerging from the University of Córdoba (Argentina), the Federal University of Rio Grande do Sul, and the National University of La Plata. Nests are constructed on elevated sites recorded in inventories by municipal authorities such as the Porto Alegre Municipal Secretariat for Environment and protected-area summaries from the Ibera Wetlands. Clutch size, incubation, and fledging periods are reported in longitudinal studies housed at academic repositories including those of the University of Chile and the University of Brasília.
The species is assessed by the IUCN Red List as of least concern, with population and threat analyses incorporated into regional management plans from ministries like the Argentine Ministry of Environment and the Brazilian Institute of Environment and Renewable Natural Resources (IBAMA). Human interactions recorded by local environmental NGOs such as SOS Mata Atlântica Foundation, eco-tourism operators in the Ibera National Park, and community outreach programs by the National Geographic Society highlight both cultural prominence and conflict in agroecosystems. Conservation measures intersect with policies shaped by entities including the Convention on Biological Diversity, the Ramsar Convention, and national protected-area systems administered by institutions like the Servicio Nacional de Áreas Naturales Protegidas.