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Incubation is entirely or mostly by female (fed by male), 18-21 days. Young are tended by both parents, leave nest in 5-6 weeks. When food supply is limited, smallest chick often does not survive. Young remain with parents for several weeks after fledging.","ecologyComments":"May roost communally in groups of up to several hundred individuals (e.g., see Wilson Bull. 104:105-121). <br><br>Home range size of breeding birds was 0.2-4.4 square kilometers in coastal California, where ranges of nesting pairs sometimes overlapped; breeding season home range averaged 6.6 square kilometers in Utah, 9.4 square kilometers in Wyoming (see Linz et al. 1992). Territories in Minnesota were much larger, averaging 40.5 square kilometers (Bruggers 1998).","habitatComments":"Various situations from lowlands to mountains, open country to forested regions, and humid regions to desert; most frequently in hilly or mountainous areas, especially in vicinity of cliffs (AOU 1983). Closely associated with humans along Beaufort Sea coast of Alaska (Johnson and Herter 1989). <br><br>Nests usually on cliff ledges or in coniferous trees, also on man-made structures. See White and Tanner-White (1988) for information on the use of highway overpasses and billboards for nesting in Idaho and Utah. Often reuses nests in successive years.","generalDescription":"See Heinrich (1994, Wilson Bull. 106:571-572) for information on distinguishing juveniles and adults using plumage characteristics.","diagnosticCharacteristics":null,"speciesMarineHabitats":[],"speciesTerrestrialHabitats":[{"cagTerrHabId":-109984,"terrestrialHabitat":{"id":1,"terrestrialHabitatDescEn":"Forest - Hardwood","terrestrialHabitatDescEs":"Bosque - Madera dura","terrestrialHabitatDescFr":"Forêt — Feuillu","displayOrder":2}},{"cagTerrHabId":-109985,"terrestrialHabitat":{"id":2,"terrestrialHabitatDescEn":"Forest - Conifer","terrestrialHabitatDescEs":"Bosque - Conífera","terrestrialHabitatDescFr":"Forêt — Résineux","displayOrder":3}},{"cagTerrHabId":-109986,"terrestrialHabitat":{"id":3,"terrestrialHabitatDescEn":"Forest - Mixed","terrestrialHabitatDescEs":"Bosque - Mixto","terrestrialHabitatDescFr":"Forêt — Mixte","displayOrder":4}},{"cagTerrHabId":-109987,"terrestrialHabitat":{"id":4,"terrestrialHabitatDescEn":"Woodland - Hardwood","terrestrialHabitatDescEs":"Lote de madera - Madera dura","terrestrialHabitatDescFr":"Terrain boisé — Feuillu","displayOrder":6}},{"cagTerrHabId":-109988,"terrestrialHabitat":{"id":5,"terrestrialHabitatDescEn":"Woodland - Conifer","terrestrialHabitatDescEs":"Lote de madera - Conífera","terrestrialHabitatDescFr":"Terrain boisé — Résineux","displayOrder":7}},{"cagTerrHabId":-109989,"terrestrialHabitat":{"id":6,"terrestrialHabitatDescEn":"Woodland - Mixed","terrestrialHabitatDescEs":"Lote de madera - Mixto","terrestrialHabitatDescFr":"Terrain boisé — Mixte","displayOrder":8}},{"cagTerrHabId":-109975,"terrestrialHabitat":{"id":7,"terrestrialHabitatDescEn":"Shrubland/chaparral","terrestrialHabitatDescEs":"Matorral/Chaparral","terrestrialHabitatDescFr":"Fruticée/Chaparral","displayOrder":9}},{"cagTerrHabId":-109976,"terrestrialHabitat":{"id":8,"terrestrialHabitatDescEn":"Savanna","terrestrialHabitatDescEs":"Sabana","terrestrialHabitatDescFr":"Savane","displayOrder":10}},{"cagTerrHabId":-109977,"terrestrialHabitat":{"id":9,"terrestrialHabitatDescEn":"Grassland/herbaceous","terrestrialHabitatDescEs":"Pastizales/cobertura herbácea","terrestrialHabitatDescFr":"Prairie/couverture herbacée","displayOrder":11}},{"cagTerrHabId":-109978,"terrestrialHabitat":{"id":11,"terrestrialHabitatDescEn":"Desert","terrestrialHabitatDescEs":"Desierto","terrestrialHabitatDescFr":"Désert","displayOrder":13}},{"cagTerrHabId":-109979,"terrestrialHabitat":{"id":12,"terrestrialHabitatDescEn":"Alpine","terrestrialHabitatDescEs":"Alpino","terrestrialHabitatDescFr":"Alpin","displayOrder":14}},{"cagTerrHabId":-109980,"terrestrialHabitat":{"id":13,"terrestrialHabitatDescEn":"Tundra","terrestrialHabitatDescEs":"Tundra","terrestrialHabitatDescFr":"Toundra","displayOrder":15}},{"cagTerrHabId":-109981,"terrestrialHabitat":{"id":17,"terrestrialHabitatDescEn":"Bare rock/talus/scree","terrestrialHabitatDescEs":"Roca viva/pendiente de roca/piedras sueltas","terrestrialHabitatDescFr":"Éboulis","displayOrder":20}},{"cagTerrHabId":-109982,"terrestrialHabitat":{"id":18,"terrestrialHabitatDescEn":"Cliff","terrestrialHabitatDescEs":"Acantilado","terrestrialHabitatDescFr":"Falaise","displayOrder":21}},{"cagTerrHabId":-109983,"terrestrialHabitat":{"id":19,"terrestrialHabitatDescEn":"Cropland/hedgerow","terrestrialHabitatDescEs":"Tierras cultivadas/cerco vivo","terrestrialHabitatDescFr":"Terre cultivée/haie","displayOrder":22}}],"speciesRiverineHabitats":[],"speciesPalustrineHabitats":[{"cagPalusHabId":-102857,"palustrineHabitat":{"id":6,"palustrineHabitatDescEn":"Riparian","palustrineHabitatDescEs":"Ribereño","palustrineHabitatDescFr":"Riverain","displayOrder":6}}],"speciesLacustrineHabitats":[],"speciesSubterraneanHabitats":[],"speciesEstuarineHabitats":[{"cagEstuarineHabId":-101213,"estuarineHabitat":{"id":4,"estuarineHabitatDescEn":"Tidal flat/shore","estuarineHabitatDescEs":"Marea plana/orilla","estuarineHabitatDescFr":"Replat de marée/rivage","displayOrder":4}}]},"primaryReference":{"id":134424,"citation":"American Ornithologists' Union (AOU). 1998. Check-list of North American birds. Seventh edition. American Ornithologists' Union, Washington, D.C. [as modified by subsequent supplements and corrections published in <i>The Auk</i>]. Also available online: http://www.aou.org/.","shortCitationAuthor":"American Ornithologists' Union (AOU)","shortCitationYear":1998,"referenceCode":"B98AOU01NAUS","lastModified":"2020-02-25T14:38:12.673494Z"},"predecessors":[],"elementGlobalThreatAssessments":[]}