Swainson's Hawk - Factbites

Swainson's Hawk - Factbites
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Topic: Swainson's Hawk

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In the News (Thu 31 Dec 09)

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	What Barbara's Camera Sees
		Juvenile Swainson's Hawk (Buteo swainsoni): The speckled chest is a characteristic of the immature Swainson's hawk.
		The Swainson's Hawk was named in honor of the early 19th century English ornithologist William Swainson [1789-1855].
		Swainson's Hawk (Buteo swainsoni): has long, narrow, pointed wings and extremely variable plumage.
	barbarascamera.com /swainson.html (127 words)

	Student Research Colloquium
		Swainson’s (Buteo swainsoni) and ferruginous hawks (B. regalis) are two grassland raptors that have shown recent declines in parts of their range.
		The majority of ferruginous hawk nests were found in areas of 0-30% cultivation, while cultivation around Swainson’s hawk nests ranged from 0-90%.
		On average, ferruginous hawk nests were surrounded by more prairie and less cropland than Swainson’s hawk nests.
	www.stcloudstate.edu /src/colloquium/searchAbstract.asp?proID=470 (294 words)

	Resources on the White-tailed Hawk from academic institutions
		: Buteo swainsoni Swainson's Hawk Swainson's Hawk 08012130600WHTHAW Buteo albicaudatus White-tailed Hawk White-tailed Hawk 08012130601SWTHAW Buteo albicaudatus 1...
		Classification of birds of South America Part 02 :...throated Hawk 22 Buteo swainsoni Swainson's Hawk (NB) 23 Buteo galapagoensis Galapagos Hawk 23 Buteo albicaudatus White-tailed Hawk 23, 23a Buteo polyosoma Red...
		Habitat types characterized by dense vegetation are avoided by Ferruginous Hawks because of...
	mongabay.org /conservation/White-tailed_Hawk.htm (294 words)

	Canadian Peregrine Foundation - Raptor Identification
		Most of the species discussed on this page are widespread across much of North America; notable exceptions are the Gyrfalcon (restricted to the Arctic in summer and rarely south of Canada even in winter), the Swainson's Hawk (primarily western), the Broad-winged Hawk (primarily eastern), and the Red-shouldered Hawk (primarily eastern, plus in California).
		Rough-legged Hawk, Red-tailed Hawk, Swainson's Hawk, Northern Goshawk, Gyrfalcon
		Red-tailed Hawk, Red-shouldered Hawk, Broad-winged Hawk, Swainson's Hawk, Sharp-shinned Hawk, Cooper's Hawk, Northern Goshawk
	www.peregrine-foundation.ca /identification.html (294 words)

	Was that a hawk's nest? Fish & Game gets curious - 2005-06-13
		The state's endangered species law protects the Swainson's hawk, a bird popular enough with local environmentalists to have inspired its own protection group.
		Acting on an anonymous tip, Fish and Game has been investigating whether Padilla illegally cut down a tree containing a Swainson's hawk nest in Natomas.
		"I took the time to make damn sure there were no hawks in the area."
	www.bizjournals.com /sacramento/stories/2005/06/13/tidbits1.html (294 words)

	Scotter's webpage - Wildlife Rehabilitaton Photos - Raptors
		Distribution: In Alberta, the Swainson's hawk is a bird of the prairies, found mostly south of the North Saskatchewan River and east of the Rocky Mountains.
		The continued use of pesticides such as DDT in some South American countries has left the Swainson's Hawk vulnerable to pesticide poisoning.
		The population of Rough-legged hawks cycles with the population of its main prey, the lemming.
	scotter.ca /raptors.html (294 words)

	Eagle-Eye Tours Costa Rica Hawk Migration
		The majority of the migrating raptors are Turkey Vultures, Swainson’s Hawks and Broad-winged Hawks, but there are also Peregrine Falcon, Merlin, Osprey, Mississippi Kite, Cooper’s Hawk, and Sharp-shinned Hawk.
		Ernesto showed me the counter for the number of Swainson’s Hawks ‘1,121’, but he was counting in 10s.
		Hawks, Broad-winged Hawks and Turkey Vultures in the hundreds of thousands plus smaller numbers of other species funnel along Costa Rica’s Caribbean coast.
	www.eagle-eye.com /Locations/CR-HawkMigration.html (294 words)

	Wildlife_2.html
		Decreases in nesting red-tailed and Swainson's hawks may have been related to impacts that occurred during their migration and/or while they were on their wintering grounds.
		The sharp declines in red-tailed and Swainson's hawk nests in the late 1980s are probably not a result of Hanford Site activities because the number of nests for the very sensitive ferruginous hawk did not decline (Figure 4.2.4).
		Nesting pairs of red-tailed hawks increased in 1991 and 1992 to approximately 25, which represents a high for the species.
	www.pnl.gov /env/Wildlife_2.html (1417 words)

	Publications List
		Day RH, Wolfe DH, Colbert KV, Sherrod SK (1993) Population census and productivity of nesting Golden Eagles, Prairie Falcons, Cooper's Hawks, Swainson's Hawks, and Ferruginous Hawks in Cimarron County, Oklahoma.
		Day RH, Wolfe DH, Colbert KV, Sherrod SK (1992) Population census and productivity of nesting Golden Eagles, Prairie Falcons, Cooper's Hawks, Swainson's Hawks, and Ferruginous Hawks in Cimarron County, Oklahoma.
		key words: ecotone, gene flow, hybrid zone, mate choice, Melospiza melodia, signaling, Song Sparrow, speciation
	www.suttoncenter.org /pubs.html (1417 words)

	William Swainson - Wikipedia, the free encyclopedia
		Swainson's friend John James Audubon named Swainson's Warbler after him, Charles Lucien Bonaparte named Swainson's Hawk for him, and Swainson's Thrush was named for him by Thomas Nuttall.
		Swainson travelled in Brazil from 1816 to 1818, returning to England with a collection of over 20,000 insects, 1,200 species of plants, drawings of 120 species of fish, and about 760 bird skins.
		Swainson continued with his writing, the most influential of which was the second volume of Fauna Boreali-Americana (1831) which he co-authored with John Richardson.
	en.wikipedia.org /wiki/William_Swainson (309 words)

	CVBDB Swainson's Hawk
		Swainson's hawks are summer breeders in California with approximately 80 percent of the pairs nesting in the southern Sacramento and northern San Joaquin Valleys.
		Swainson's hawks nesting in the Central Valley are generally found in scattered trees or along riparian systems adjacent to agricultural fields or pastures.
		Swainson's hawks generally search for prey by soaring and several hawks may be seen foraging together following tractors or other farm equipment capturing prey escaping from farming operations.
	www.delta.dfg.ca.gov /gallery/swainson.asp (397 words)

	Swainson's Hawk
		Swainson’s Hawks mainly hunt mice, ground squirrels, rabbits, birds, and reptiles during the breeding season, and largely live off insects like grasshoppers, locust, and beetles during the non-breeding season.
		Swainson’s Hawks usually hunt by swooping down from a perch or while walking along the ground, and may hunt in teams.
		Most Swainson’s Hawks migrate in large flocks to their wintering grounds in South America, and are gregarious and will congregate in huge numbers at a good food supply.
	www.peregrinefund.org /Explore_Raptors/hawks/swainson.html (278 words)

	Swainson's Hawk (Buteo swainsoni)
		Swainson's hawks inhabit desert and dry shrubsteppe habitats where surface water is unavailable, suggesting that drinking water is not required for survival.
		Swainson's Hawks construct their nests in a wide variety of trees species, existing as riparian forest, remnant riparian trees, planted windbreaks, shade trees at residences and along roadsides, and solitary upland oaks.
		In California, Swainson's Hawks are currently absent from much of their historic breeding range in the central and southern portions of the state, and overall may have declined by as much as 90% (Bloom 1980).
	www.prbo.org /calpif/htmldocs/species/riparian/swainsons_hawk.htm (5444 words)

	Swainson's Hawk
		Swainson's Hawks forage communally for rodents in cultivated areas during and after harvest, when prey are abundant and easily located, and during flood irrigation and burning of fields, when prey tend to concentrate on field margins.
		Swainson's Hawks feed largely on mammals, birds, and reptiles during the breeding season, but are almost exclusively insectivorous for the rest of the year.
		Swainson's Hawks breed in western North America, from the Great Plains west to the Great Basin and the Central Valley of California, and from central Saskatchewan and Alberta south to northern Mexico.
	www.shawcreekbirdsupply.com /swainsons_hawk_info.htm (849 words)

	Swainson's Hawk #28955
		Swainson’s Hawk populations declined significantly with the passing of the prairie.
		Swainson’s Hawks are unique among hawks in their genus in that, like many kite species, they spend most of their life flocking with others of their kind.
		Swainson’s Hawks, on the other hand, commonly migrate clear to the pampas of Argentina, and roost communally all winter in flocks numbering up to thousands of hawks.
	www.saaudubon.org /articles/Swainsons_Hawk_28955.html (668 words)

	Swainson's Hawk
		Swainson's hawks are common summer residents in South Dakota, found in large numbers throughout the central and western portions of the state.
		Swainson's hawks are large birds of prey with a characteristic body common to other North American buteos.
		A Swainson's is a stocky bird that averages 21 inches (53 cm) in length with a wingspan of over four feet (132 cm).
	www.northern.edu /natsource/BIRDS/Swains1.htm (909 words)

	Swainson's Hawk - Wikipedia, the free encyclopedia
		The Swainson's Hawk, Buteo swainsoni, is a large hawk.
		Although the use of DDT has been banned in the United States, the Swainson's Hawk still encounters pesticide use when it migrates in the winter to Argentina.
		This bird was named after William Swainson, a British naturalist.
	en.wikipedia.org /wiki/Swainson's_Hawk (294 words)

	Effects of Management Practices on Grassland Birds: Swainson's Hawk
		Swainson's Hawks nest in trees and shrubs that are either isolated, clumped, or part of shelterbelts (Cameron 1913; Saunders 1914; Bent 1961; Olendorff 1973; Maher 1974; Salt and Salt 1976; Dunkle 1977; Green and Morrison 1983; Thurow and White 1983; Schmutz 1984; Murphy 1991, 1993; Cable et al.
		Swainson's Hawks breed from the southern Yukon Territories, through western British Columbia, to southern Alberta, Saskatchewan, and southwestern Manitoba, south from Washington, Idaho, Montana, and North Dakota to California, Arizona, and New Mexico, and east to western Minnesota, northwestern Iowa, northwestern Missouri, Nebraska, central Oklahoma, and central Texas (National Geographic Society 1999).
		Swainson's Hawks may favor nest sites near either very low amounts of cropland, because of greater prey densities there, or very high amounts of cropland, because of the ease with which prey can be captured in harvested fields (Groskorth 1995).
	www.npwrc.usgs.gov /resource/literatr/grasbird/swha/swha.htm (3826 words)

	Rally to Save Swainson's Hawk - News of the Wild - Winter 2004
		Researchers are racing to learn more about the Swainson's hawks in Illinois, such as their habitat requirements, the size of their home ranges, and how they use their habitat.
		Since the mid-1970s, when the Swainson's hawks were first discovered here, the rolling, rural landscape around Hampshire, Illinois, has harbored a small population of about five nesting pairs of the birds, which summer here each year.
		More information about the Swainson's hawk and the development of its habitat is available from the Bird Conservation Network at (847) 965-1150.
	chicagowildernessmag.org /issues/winter2004/news/swainsons.html (358 words)

	Swainson's Hawk
		The Swainson's hawk is a medium-sized hawk with dark brown plumage and a brown breast, pale belly, and a white patch under the bill.
		Swainson's Hawk in Pima Country: Since the 1940s, populations of the Swainson's hawk have declined by ninety percent.
		The Swainson's hawk will take advantage of certain farming activities such as plowing by either perching on the ground or diving down onto prey that has been stirred up by the tractor.
	www.co.pima.az.us /cmo/sdcp/sdcp2/fsheets/vuln/sh.html (350 words)

	Swainson's Hawk
		The Swainson's Hawks basic requirements are large, open grasslands with abundant prey in association with suitable nest trees such as oaks, cottonwoods, walnuts, and willows in the Central Valley, and juniper in the Great Basin.
		Swainson's Hawks are masters at using the wind's propulsion and gravity to soar wherever they please.
		Swainson's Hawks have adapted to hunting in certain types of agricultural lands which makes them vulnerable to changes in the land's use.
	www.dfg.ca.gov /te_species/index/classification/birdslist/swainhawk.html (1056 words)

	Swainson's Hawk Detailed Information - Montana Animal Field Guide
		Swainson's hawks leave in late September, migrating to Argentina for the winter.
		Swainson's hawks range in length from 18-22 inches, and have a wingspan of 48-52 inches.
		Swainson's hawks are more tolerant of humans than other hawks, and will often nest close to occupied houses.
	fwp.state.mt.us /fieldguide/detail_ABNKC19070.aspx (532 words)

	Shrub-Steppe Series: What About Swainson's Hawk?
		Swainson's hawks are the smallest buteo hawk inhabiting southeastern Washington.
		Swainson's hawks are noted for their remarkable long-distance migration from North America to the grasslands of Argentina and back again.
		Swainson's hawks are one of many species of hawks living in the Columbia Basin.
	www.pnl.gov /pals/resource_cards/Swainson's_Hawk.stm (833 words)

	Swainson's Hawk
		Swainson's hawk is listed by the U.S. Fish and Wildlife Service as a Category 2 species (Federal Register 47{251}: 58454-58460) indicating that additional information is needed to make an assessment of the species status.
		Rosche (1979) found Swainson's hawk in the lower North Platte River Valley during 23 April to 11 September.
		Breeding Population: The population in 1979-1980 was estimated at 250 breeding pairs.
	www.npwrc.usgs.gov /resource/distr/birds/platte/species/buteswai.htm (413 words)

	NWF - International Wildlife Magazine - Birds, Swainson's Hawk
		Swainson's hawks are large birds--they weigh about 500 grams (1.1 lb.)--that range in color from sooty black to rufous to brown-backed with creamy white breast marked by a dark band.
		In 1994, Woodbridge trapped two adult, female Swainson's hawks on the Butte Valley National Grasslands in northern California and fitted them with 30-gram (1 oz.) radio transmitters that allowed him and his colleagues to track the birds by satellite relays.
		The likelihood that the 450,000 Swainson's hawks that ranged over North America were rendezvousing in Argentina was soon corroborated by Woodbridge's satellite tracking.
	www.nwf.org /internationalwildlife/hawk.html (2224 words)

	Swainson's Hawk
		Sacramento-based Friends of Swainson's Hawk filed suit this week against the city of Davis, alleging that the plans for Covell Village don't include a plan for...
		So does the double-crested cormorant, Swainson's hawk, grasshopper sparrow and dozens of other birds found in the flat farmlands, steep coastal hills and tule...
		It also is considered habitat for 122 protected species, mainly the Swainson's hawk and the giant garter snake.
	www.conservation.mongabay.com /news/Swainson's_Hawk.htm (856 words)

	Audubon WatchList - Swainson's Hawk
		Swainson's is distinguished from White-tailed Hawks which lack the dark breast-band and a white tail with one black band just before the tip.
		Swainson's Hawks have the second longest migration of all raptor species; this species migrates over 10,000 km every spring and fall between its breeding grounds in North America to its wintering grounds in South America.
		Swainson's no longer breed along the southern California coast because it is too highly developed and it no longer occurs in the Mojave Desert.
	audubon2.org /webapp/watchlist/viewSpecies.jsp?id=199 (1200 words)

	PANUPS: Swainson's Hawk Agreement
		Scientists in Canada and the U.S. have observed declining Swainson's hawk populations for several years, but little was known about their migratory habits until 1994, when U.S. biologists documented that large flocks of the raptors congregated in an agricultural region of Argentina 300 miles west of Buenos Aires.
		Tens of thousands of Swainson's hawks have died in Argentina in recent years after consuming monocrotophos, an organophosphate insecticide that farmers apply to alfalfa fields for grasshopper control.
		One scientist involved in the meetings expressed concern about the replacements, stating that Swainson's hawks "may be very sensitive to organophosphates." According to agriculture officials in Argentina, pesticide use for grasshopper control will likely increase because farmers are under intense economic pressure to intensify agricultural production for the international market.
	www.ibiblio.org /InterGarden/agriculture/forums/sustainable-agriculture2/msg02759.html (678 words)

	Swainson's Hawk
		Swainson's Hawks can easily be detected and identified as they soar on slightly raised wings.
		The Swainson's Hawk arrives in March and April and departs in late August and September (Robbins and Easterla 1992).
		Large flocks of Swainson's Hawks migrate between their winter grounds in southern South America and breeding grounds in the western North American Plains.
	www.conservation.state.mo.us /nathis/birds/birdatlas/maintext/0400127.htm (375 words)

	William Swainson - Wikipedia, the free encyclopedia
		Swainson's friend John James Audubon named Swainson's Warbler after him, Charles Lucien Bonaparte named Swainson's Hawk for him, and Swainson's Thrush was named for him by Thomas Nuttall.
		William Swainson (October 8, 1789- December 6, 1855), was an English ornithologist and artist.
		Swainson was born in St. Mary Newington, London.
	en.wikipedia.org /wiki/William_Swainson (319 words)

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In the News (Thu 31 Dec 09)