Click on the language to view common names.
Common Names in Dutch:
Common Names in English:
Cooper's Hawk, Big Blue Darter, Chicken Hawk, Hen Hawk, Mexican hawk, quail hawk, striker, swift hawk
Common Names in French:
epervier de Cooper
Common Names in German:
Common Names in Japanese:
Common Names in Spanish:
Gavil, Gavilán de Cooper
Adult : Head : dark gray or black on top Crown: usually blackish, distinctly darker than back Ear Tufts: deep red to yellow Face : Cere: yellow Eye Color: red Facial Skin : yellow Bill: black with gray base Body: Belly: reddish bars Breast: reddish bars Underparts: more finely barred, on average, than Sharp-Shinned Hawk Legs : Leg Color: yellow Tail: dark bars and a white band on tip Shape : rounded.Immature: Head: dark gray or black on top Crown: usually blackish, distinctly darker than back Ear Tufts: deep red to yellow Face: Cere: yellow Eye Color: red Facial Skin: yellow Bill: black with gray base Body: Belly: reddish bars Breast: reddish bars Underparts: more finely streaked than immature Sharp-Shinned Hawk Legs: Leg Color: yellow Tail: dark bars and a white band on tip Shape: rounded.
have a dark gray to black crown; black back and wings
and light banding
on the tail; thick white band
at the tip
tail; reddish barring on the white chest and belly; white undertail
have variable brown streaking
throughout the body;
dark and light banding on the tail.
Adult: Red eye · Black cap · Blue-gray back and upperwings · White breast, belly and underwing coverts marked by fine, thin, reddish bars · White undertail coverts · Tail, blue gray above and pale below, barred with black bands · Flight feathers, blue-gray above and pale below, with dark bars
Immature: Yellow eye · Brown head with indistinct pale supercilium · Brown cap, nape, back, and upperwings · White underparts marked by thin black streaks, concentrated on chest · Tail, brown above and pale below, barred with dark bands · White terminal band
About 14 to 21 inches long, with a wingspan of 27 to 36 inches. Adults weigh about 12.3 ounces .
In the Southeast, non-breeding habitat
use is similar to breeding
The Cooper’s hawk breeds primarily in riparian areas and oak woodlands and apparently is most common in montane canyons (Garrett and Dunn 1981; Hamilton and Willick 1996). It frequents landscapes where wooded areas occur in patches and groves and often uses patchy woodlands and edges with snags for perching (Beebe 1974). Dense stands with moderate crown-depths are usually used for nesting (Zeiner, et al. 1990). Migrant and wintering birds are generally more catholic in their choice of habitats and may be found with regularity in developed (e.g. , suburban) areas. They hunt in broken woodland and habitat edges, catching predominantly avian prey in air , on the ground , and in vegetation. This species is seldom found in areas without dense tree stands or patchy woodland habitat (Zeiner, et al. 1990). Within the range in California, it most frequently uses dense stands of live oak, riparian deciduous, or other forest habitats near water (Zeiner, et al. 1990). The Cooper’s hawk tends to nest in stands with lower densities of taller and larger trees and a greater proportion of hardwood cover than conifer species when compared to other accipiters (Trexel, et al. 1999).
The Cooper’s hawk apparently reduces the niche overlap with the northern goshawk by using areas with greater shrub cover, flatter terrain, and locations that are closer to roads, forest openings, and human habitation (Bosakowski, et al. 1992).
The Cooper’s hawk is tolerant of human disturbance and habitat fragmentation and breeds in suburban and urban settings (Murphy, et al. 1988). The urban sites have included isolated trees in residential neighborhoods with commercial and recreational activities less than 150 meters distant and houses 20 to 30 meters distant. Typically, there is some forest edge habitat included within their home range even if nesting within an urban setting and this forest edge may serve as the primary hunting site (Rosenfield and Bielefeldt 1993).
Vegetation: tropical deciduous forests, gallery forests, tropical lowland evergreen forest, pine-oak forests • Minimum Elevation: 600 meters • Maximum Elevation: 3,000 meters • Foraging Strata: Canopy • Center of Abundance: Upper subtropical: higher slopes, 500-1,600 m.; subtropics. • Sensitivity to Disturbance: Medium
Typically found at an altitude of 0 to 3,787 meters (0 to 12,425 feet).
List of Habitats
- 1 Forest
- 1.4 Forest - Temperate
- 1.5 Forest - Subtropical/Tropical Dry
- 1.6 Forest - Subtropical/Tropical Moist Lowland
- 1.9 Forest - Subtropical/Tropical Moist Montane
- 3 Shrubland
- 3.4 Shrubland - Temperate
- 14 Artificial/Terrestrial
- 14.4 Artificial/Terrestrial - Rural Gardens
- 14.5 Artificial/Terrestrial - Urban Areas [more info]
items, especially passerines
, comprise 70 percent of the
number of food items and 58 percent of the dietary biomass
to Cooper’s hawk broods at two nests
surrounded by a mixed grass
prairie with mammalian prey making up the remainder (Peterson and
Murphy 1992). In general, during breeding and non-breeding, the species
uses avian prey predominantly, sometimes taking fish and mammals
(Terres 1980). In comparison to the northern goshawk, the Cooper’s
hawk takes more avian prey (Bosakowski, et al.
1992; Whaley and White,
1994). The Cooper’s hawk catches small birds, especially young birds
during the nesting season
, and small mammals; it also takes reptiles
The Cooper’s hawk hunts in broken woodland and habitat edges ; it catches prey in the air , on the ground , and in vegetation. Sometimes it runs prey down in dense thickets. It uses cover to hide, attack, and approach prey; ut also soars and makes low, gliding search flights (Zeiner, et al. 1990). It forages by dashing through the woods in a low, swift flight, around trees , through the brush and reaches out in the air or on the ground to catch avian prey with the talons (Terres 1980). After catching its prey, the Cooper’s hawk may fly with the prey to a water source in order to drown it (Terres 1980).
The Cooper’s hawk breeds
primarily in riparian
areas and oak woodlands
and apparently is most common in montane
(Garrett and Dunn
1981; Hamilton and Willick 1996). It usually nests
conifer stands, or in deciduous riparian areas, usually near streams
Nesting and foraging
usually occur near open water
or riparian vegetation
(Zeiner, et al.
1990). Throughout much of the west, the Cooper’s
hawk nests in stands of cottonwoods along stream courses especially
where the tree
stands are fairly large (Call
1978). Denser stands
of trees with moderate crown-depth are used for nesting. It appears
that the vertical
structure of the nest site tree is more important
to the nest-site selection than the horizontal structure (Wiggers
and Kritz 1991).
A study comparing nesting habits of Cooper’s hawk and sharp-shinned hawk, found that Cooper’s hawks “tend to nest in stands with lower densities of taller and larger trees with a greater proportion of hardwood cover” (Trexel, et al. 1999). It apparently does not tolerate nesting sharp-shinned hawks in the vicinity of its nest (Terres 1980).
In urban settings in Tucson, Arizona, Cooper’s hawks have been found nesting mainly in eucalyptus (70.8%), aleppo pine (25.0%) and cottonwood trees (4.2%) (Boal, et al. 1998). Nest trees were found to be taller and of greater diameter than randomly sampled trees and thus had more canopy cover and the nest trees were often the largest tree in the nest site. Although nest sites were always in heavily forested areas, they were significantly closer to forest openings and wetland, were usually on level ground and were never located on a ridgeline or steep upper slope (Bosakowski, et al. 1992a).
It locates its nest on a horizontal limb of a pine or hardwood, near the trunk or in the crotch of a hardwood tree species, usually 10 to 60 feet above the ground and sometimes uses an old nest of a crow (Harrison 1978). It also often nests just below the lowest live limbs (Zeiner, et al. 1990). The nest is typically a platform of sticks and twigs lined with bark (Call 1978). Cooper’s hawk eggs are laid in February through June and the clutch size is 3 to 6; usually 4 to 5 (Brown and Amadon 1968). Eggs are incubated mostly by the female for approximately 24 days (Terres 1980). In rural Wisconsin, Rosenfield, et al. (1995) found a minimum intergeneration turnover time of six years for breeding Cooper’s hawks.
Dispersal : Although it is mostly a year-long resident, some Cooper’s hawks from more northern areas, migrate into California. The Cooper’s hawk may also move downslope and south from areas of heavy snow and return to the general nesting area in the spring (Zeiner, et al. 1990). The mean distance from the natal site to the breeding site is 12 kilometers for males and 14.4 kilometers for females. Adult birds frequently reoccupy nesting areas and breeding site fidelity is assumed (Rosenfield and Bielefeldt 1993). The Cooper’s hawk may reuse the same nest site for multiple years (Call 1978).
The breeding season begins in early April and extends until late May. Breeding habitat is usually deciduous or conifer woods with nearby water. The nest is commonly in a tree about 35 - 45 feet ( m ) above the ground. The male and female build a platform-style nest near the trunk of the tree out of sticks and twigs and line it with wood chips, bark strips, and down . The female lays 3 - 6 (usually 4 - 5) eggs that she incubates for 32 - 36 days. The male usually feeds the incubating female. The young are semi-altricial and fledge 27-34 days after hatching . The female provides most of the care for the young at the nest. The male young usually fledge sooner than their female siblings. The young birds return to the nest for about 10 days after fledging to be fed. They become independent of the adults at about 8 weeks after they hatch .
- Breeding Habitat: Woodland
- Clutch Size: 4-5
- Length of Incubation : 32-36 days
- Days to Fledge: 27-34
The species is a year-long, diurnally active
bird (Zeiner, et al.
Survival: One banded individual was recorded as being shot at 7 years 5 months old (Terres 1980). The maximum reported age is 12 years (Rosenfield and Bielefeldt 1993). The yearly fledgling success is about 2 young/ pair with nesting success of 57 percent to 93 percent (Craighead and Craighead 1956; Rosenfield and Bielefeldt 1993). Mortality rates have been estimated as 72 percent to 78 percent in the first year, 34 percent to 37 percent thereafter (Rosenfield and Bielefeldt 1993).
Socio-Spatial Behavior: Nest sites within stands of oaks are located approximately 1.6 miles apart and thus are distributed widely but sparsely within woodland habitat (Zeiner, et al. 1990). The seasonal home range size has been estimated at 784 hectares with the daily home range averaging 231 hectares (Murphy, et al. 1988). Cooper’s hawks may require a minimum of 15 acres of suitable, undisturbed timber for nesting (Call 1978). Rosenfield, et al. (1995) found a nesting density of 331 ha/pair in a long-term study in rural Wisconsin. Studies of urban areas have reported a maximum density of 272 ha/pair, according to this same study. In Michigan, Craighead and Craighead (1956) measured four home ranges that averaged 311 ha (768 ac) and varied from 96-401 ha (237-992 ac); they estimated that 17 other home ranges averaged 207 ha (512 ac), and varied from 18-531 ha (45-1312 ac). They reported one home range in Wyoming of 205 ha (506 ac). Males defend an area about 100 m (330 ft ) around potential nest sites prior to pair formation (Brown and Amadon 1968). Nests in Oregon were 3.2 to 4.2 km (2 to 2.6 mi ) apart (Jackman and Scott 1975). Elsewhere, nests have been reported 1.6 to 2.4 km (1 to 1.5 mi) apart (Meng 1951, Brown and Amadon 1968). Of 77 territories in California, in oak stands, mean distance between nests was 2.6 km (1.6 mi) (Zeiner, et al. 1990).
- Whittaker & Margulis,1978
- C. Linnaeus, 1758
- (Hatschek, 1888) Cavalier-Smith, 1983
- Grobben, 1908
- (Haeckel, 1874) Cavalier-Smith, 1998
- Bateson, 1885
- Cuvier, 1812
- Jawed Vertebrates
- Goodrich, 1930
- Linnaeus, 1758
- Gauthier, 1986
- (C. Linnaeus, 1758)
- Pycraft, 1900
- Seebohm, 1890
- Sharpe, 1874
- (C. Linnaeus, 1758)
- Infraorder: Falconides () - Sharpe, 1874
- Suborder: Accipitres () - (C. Linnaeus, 1758)
- Order: Accipitriformes () - Sharpe, 1874
- Superorder: Falconimorphae () - Seebohm, 1890
- Cohort: Neognathae () - Pycraft, 1900
- Infraclass: Aves () - (C. Linnaeus, 1758)
- Subclass: Avialae () - Gauthier, 1986
- Class: Aves () - Linnaeus, 1758
- Superclass: Tetrapoda () - Goodrich, 1930
- Infraphylum: Gnathostomata () - auct. - Jawed Vertebrates
- Subphylum: Vertebrata () - Cuvier, 1812 - Vertebrates
- Phylum: Chordata () - Bateson, 1885 - Chordates
- Infrakingdom: Chordonia () - (Haeckel, 1874) Cavalier-Smith, 1998
- Branch: Deuterostomia () - Grobben, 1908
- Subkingdom: Bilateria () - (Hatschek, 1888) Cavalier-Smith, 1983
- Kingdom: Animalia () - C. Linnaeus, 1758 - animals
Accipiter cooperi • Accipiter cooperii (Bonaparte, 1828)
Status: Accepted Name
Last scrutiny: 17-Oct-2001
Members of the genus Accipiter
ZipcodeZoo has pages for 112 species and subspecies in this genus. Here are just 100 of them:
A. albogularis (Pied Goshawk) · A. albogularis albogularis (Pied Goshawk) · A. albogularis woodfordi (Pied Goshawk) · A. badius (Shikra) · A. badius badius (Little Banded Goshawk) · A. badius cenchroides (Shikra) · A. badius dussumieri (Shikra) · A. badius poliopsis (Shikra) · A. bicolor (Bicolored Hawk) · A. bicolor bicolor (Bicolored Hawk (Bicolored)) · A. bicolor chilensis (Bicolored Hawk (Chilean)) · A. bicolor guttifer (Bicolored Hawk) · A. bicolor pileatus (Bicolored Hawk (Spotted)) · A. brachyurus (New Britain Sparrowhawk) · A. brevipes (Levant Sparrowhawk) · A. buergersi (Chestnut-Shouldered Goshawk) · A. butleri (Nicobar Sparrowhawk) · A. butleri butleri (Nicobar Sparrowhawk) · A. castanilius (Chestnut-Flanked Sparrowhawk) · A. chilensis (Chilean Hawk) · A. chionogaster (White-Breasted Hawk) · A. cirrhocephalus (Australian Collared Sparrow Hawk) · A. cirrhocephalus cirrhocephalus (Australian Collared Sparrow Hawk) · A. cirrocephalus (Collared Sparrowhawk) · A. cirrocephalus cirrocephalus (Australian Collared Sparrow Hawk) · A. collaris (Semicollared Hawk) · A. cooperi (Big Blue Darter) · A. cooperii (Cooper's Hawk) · A. erythrauchen (Rufous-Necked Sparrowhawk) · A. erythrauchen ceramensis (Rufous-Necked Sparrowhawk) · A. erythronemius (Rufous-Thighed Hawk) · A. erythronemius erythronemius (Rufous-Thighed Hawk) · A. erythropus (Red-Thighed Sparrowhawk) · A. erythropus erythropus (Red-Thighed Sparrow Hawk) · A. fasciatus (Brown Goshawk) · A. fasciatus fasciatus (Brown Goshawk) · A. fasciatus hellmayri (Brown Goshawk) · A. fasciatus natalis (Christmas Island Nighthawk) · A. francesiae (Frances' Sparrow Hawk) · A. francesiae francesiae (Frances's Sparrowhawk) · A. francesii (Anjouan Island Sparrow Hawk) · A. francesii francesii (Frances' Sparrow Hawk) · A. francesii pusillus (Anjouan Island Sparrow Hawk) · A. gentilis (Northern Goshawk) · A. gentilis apache (Apache Northern Goshawk) · A. gentilis atricapillus (Northern Goshawk (American)) · A. gentilis gallinarum (Northern Goshawk) · A. gentilis gentilis (Northern Goshawk) · A. gentilis laingi (Northern Goshawk) · A. griseiceps (Sulawesi Goshawk) · A. gularis (Japanese Sparrowhawk) · A. gularis gularis (Japanese Lesser Sparrow Hawk) · A. gundlachi (Gundlach's Hawk) · A. gundlachii (Gundlach's Hawk) · A. gundlachi gundlachi (Gundlach's Hawk) · A. haplochrous (New Caledonia Goshawk) · A. henicogrammus (Moluccan Goshawk) · A. henstii (Henst's Goshawk) · A. hiogaster albiventris (Variable Goshawk) · A. hiogaster polionotus (Variable Goshawk) · A. hiogaster sylvestris (Variable Goshawk) · A. imitator (Imitator Sparrowhawk) · A. luteoschistaceus (Slaty-Mantled Goshawk) · A. madagascariensis (Madagascan Sparrowhawk) · A. melanochlamys (Black-Mantled Goshawk) · A. melanoleucus (Black Sparrowhawk) · A. melanoleucus melanoleucus (Black Sparrowhawk) · A. meyerianus (Meyer's Goshawk) · A. minullus (Little Sparrowhawk) · A. minullus minullus (Little Sparrowhawk) · A. nanus (Small Sparrowhawk) · A. nisus (Eurasian Sparrowhawk) · A. nisus dementjevi (Eurasian Sparrowhawk) · A. nisus granti (Eurasian Sparrowhawk) · A. nisus nisus (Eurasian Sparrowhawk) · A. novaehollandiae (Gray Goshawk) · A. novaehollandiae novaehollandiae (Grey Goshawk) · A. ovampensis (Ovampo Sparrowhawk) · A. poliocephalus (Gray-Headed Goshawk) · A. poliogaster (Gray-Bellied Hawk) · A. princeps (New Britain Goshawk) · A. radiatus (Doria's Goshawk) · A. rhodogaster (Vinous-Breasted Sparrowhawk) · A. rhodogaster rhodogaster (Vinous-Breasted Sparrow Hawk) · A. rufitorques (Fiji Goshawk) · A. rufiventris (Rufous-Breasted Sparrowhawk) · A. rufiventris rufiventris (Rufous-Breasted Sparrow Hawk) · A. soloensis (Chinese Sparrowhawk) · A. striatus (Sharp-Shinned Hawk (Caribbean)) · A. striatus chionogaster (Sharp-Shinned Hawk (White-Breasted)) · A. striatus erythronemius (Sharp-Shinned Hawk (Rufous-Thighed)) · A. striatus perobscurus (Sharp-Shinned Hawk) · A. striatus striatus (Sharp-Shinned Hawk) · A. striatus suttoni (Sharp-Shinned Hawk) · A. striatus velox (Sharp-Shinned Hawk) · A. striatus ventralis (Sharp-Shinned Hawk (Plain-Breasted)) · A. superciliosus (Tiny Hawk) · A. superciliosus superciliosus (Tiny Hawk) · A. tachiro (African Goshawk) · A. tachiro sparsimfasciatus (African Goshawk)
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- A biological survey of the sand dune region on the south shore of Saginaw Bay, Michigan. Prepared under the direction of Alexander G. Ruthven. Lansing, Mich.: Wynkoop, Hallenbeck, Crawford co., state printers, 1911. url p. 284.
- A check list of Rhode Island nesting birds, with data. [Providence? R.I.], c1908. url p. 5.
- A checklist of the vertebrate animals of Kansas / George D. Potts, Joseph T. Collins. [Lawrence, Kan.]: Museum of Natural History, University of Kansas, 1991. url p. 8.
- A first book upon the birds of Oregon and Washington; a pocket guide and pupil's assistant in a study of most of the land birds and a few of the water birds of these states. By William Rogers Lord. Portland, Ore., W. R. Lord, 1913 [c1902] url p. 270.
- A guide to the birds of New England and eastern New York; containing a key for each season and short descriptions of over two hundred and fifty species, with particular reference to their appearance in the field. Boston, Houghton, Mifflin and Company, 1904. url .
- A list of the birds of Maine, showing their distribution by counties and their status in each county. Prepared under the auspices of the United ornithologists of Maine by Ora W. Knight. .. Augusta, Kennebec journal print, 1897. url p. 59.
- A list of the birds of New Hampshire. By Glover M. Allen Manchester, N.H., Nature press, 1903. url p. 205, p. 97.
- A popular handbook of the birds of the United States and Canada / Boston: Little, Brown, 1921. url .
- A popular handbook of the ornithology of the United States and Canada: based on Nuttall's Manual / by Montague Chamberlain. Boston: Little, B., & Co., 1903. url p. 34.
- A preliminary catalog of the birds of Missouri / St. Louis: Academy of Science of St. Louis, 1907. url .
- A preliminary list of the birds found in Vermont / by George H. Perkins; assisted by Clifton D. Howe. Albany: Wynkoop Hallenbeck Crawford Co., 1901. url .
- A preliminary list of the birds of Wayne County, Ohio. Columbus, Westbote Co., State Printers, 1896. url p. 250, p. 251, p. 274.
- Abstract of the proceedings of the Linnaean Society of New York. [New York]: The Society, [1889-1932]. url p. 68.
- An authentic history of Lancaster County: in the state of Pennsylvania / by J.I. Mombert. Lancaster, Pa.: J.E. Barr & Co., 1869. url p. 504.
- An early pleistocene avifauna from Inglis, Florida / by Gail Elaine Speaker Carr. 1981. url , p. 3, p. 78.
- An ecological characterization of Coastal Maine (north and east of Cape Elizabeth) / Stewart I. Fefer and Patricia S. Schettig: principal investigators. Newton Corner, Mass.: Department of the Interior, U.S. Fish and Wildlife Service, Northeast Region, 1980. url , .
- An ecological survey in northern Michigan. Prepared under the direction of Chas. C. Adams. A report from the University museum, University of Michigan, published by the state Board of geological survey as a part of the report for 1905. Lansing, Mich., Wynkoop Hallenbeck Crawford co., state printers, 1906. url p. 122, p. 122.
- Animal Ecology. Englewood Cliffs, N.J., Prentice-Hall, 1961. url p. 456.
- Annals of the Carnegie Museum. [Pittsburgh]: Published by authority of the Board of Trustees of the Carnegie Institute, 1901- url p. 494, p. 553.
- Annotated CITES Appendices and Reservations CITES url p. 65.
- Annotated list of birds of Wellesley and vicinity; comprising the land-birds and most of the inland water-fowl of eastern Massachusetts; by Albert Pitts Morse. .. Wellesley, Mass., The author, 1897. url p. 20.
- Annual report of the Board of Regents of the Smithsonian Institution. Washington: Smithsonian Institution, -1965. url p. 437.
- Annual report of the Minnesota State Horticultural Society. Minneapolis: The Society, 1883-1898. url p. 364.
- Annual report of the New York Zoological Society. New York: The Society, 1897- url p. 155, p. 155, p. 202.
- Annual report of the Regents / Albany: J.B. Lyon, State Printer, 1890-1903. url p. 287.
- Appendices A-E: terrestrial resources injury assessment report: upper Clark Fork River NPL sites. Helena?, Mont.: Dept. of Justice?, 1995 url .
- Baby bird-finder. .. by Harriet E. Richards and Emma G. Cummings. .. Boston, Mass., W.A. Butterfield, 1904-06. url p. 103.
- Biosphere Reserves, Compilation 4, October 1986: programme on man and the biosphere (MAB) IUCN Conservation Monitoring Centre url p. 509.
- Bird blow flies (Protocalliphora) in North America (Diptera: Calliphoridae), with notes on the Palearctic species / Curtis W. Sabrosky, Gordon F. Bennett, and Terry L. Whitworth. Washington, D.C.: Smithsonian Institution Press, c1989. url p. 234.
- Bird homes. The nests, eggs and breeding habits of the land birds breeding in the eastern United States; with hints on the rearing and photographing of young birds, New York, Doubleday & McClure Co., 1900. url .
- Bird homes: The nests, eggs and breeding habits of the land birds breeding in the eastern United States with hints on the rearing and photographing of young birds / New York: Doubleday, Page & Co., 1903. url .
- Bird homes: the nests, eggs and breeding habits of the land birds breeding in the eastern United States, with hints on the rearing and photographing of young birds / New York: Doubleday & McClure, 1920, c1904. url .
- Bird homes: the nests, eggs, and breeding habits of the land birds breeding in the eastern United States; with hints on the rearing and photographing of young birds / New York: Doubleday, Page, 1905, c1904. url .
- Bird notes afield; a series of essays on the birds of California, by Charles A. Keeler. San Francisco, D.P. Elder & M. Shepard, 1899. url p. 275.
- Bird notes afield; essays on the birds of the Pacific coast with a field check list, by Charles Keeler; illustrated with reproductions of photographs. San Franciso and New York, P. Elder and company[1907, c1906] url p. 163.
- Bird populations in east central Illinois: fluctuations, variations, and development over a half-century / Champaign: University of Illinois Press, c1982. url p. 134.
- Bird studies; an account of the land birds of eastern North America, London, G. P. Putnam's Sons, 1898. url , .
- Birds / by Spencer Fullerton Baird; with the co-operation of John Cassin and George N. Lawrence. Washington, D.C., 1858. url , p. 16.
- Birds in Kansas / Max C. Thompson & Charles Ely. 1 Lawrence, Kan.: University of Kansas, Museum of Natural History: c1989- url p. 140, p. 395, p. xi.
- Birds of California; an introduction to more than three hundred common birds of the state and adjacent islands, with a supplementary list of rare migrants, accidental visitants, and hypothetical subspecies, Chicago, A. C. McClurg, 1904. url .
- Birds of Labrador / Boston: Boston Society of Natural History, 1907. url .
- Birds of Labrador / by Charles W. Townsend and Glover M. Allen. Boston: Printed for the Society, 1907. url p. 365.
- Birds of Madison County, New York / by George Charles Embody. Hamilton, N.Y.: [Republican Press], 1901. url p. 15.
- Birds of Michigan. By A. J. Cook. Lansing, Mich., R. Smith & co., state printers and binders, 1893 url p. 250, p. 251, p. 274.
- Birds of South Carolina, Charleston, S.C., [The Daggett Printing Co.]1910. url , .
- Birds of South Carolina, by Arthur Trezevant Wayne. With an introduction by the editor. Charleston, S.C., [The Daggett Printing Co.]1910. url , p. 73.
- Birds of Washington and vicinity, including adjacent parts of Maryland and Virginia, by Mrs. L. W. Maynard, with introduction by Florence A. Merriam. .. Washington, D. C., 1898. url p. 139, p. 140, p. 140, p. 197, p. 197.
- Birds of Washington and vicinity: including adjacent parts of Maryland and Virginia / by Mrs. L. W. Maynard; with introduction by Florence Merriam Bailey. Washington, D. C.: Woodward & Lothrop, 1902. url p. 140, p. 203, p. 203.
- Birds of the Pacific slope of Los Angeles County: a list with brief notes / [Pasadena, Calif.: Pasadena Academy of Sciences], 1898 url .
- Birds of the vicinity of the University of Indiana, by W. L. McAtee. [Indianapolis, Ind.]1905. url p. 82.
- Birds of the world for young people, New York, F.A. Stokes Company url .
- Brigham Young University science bulletin. 9 1967 Provo, Utah: Brigham Young University, [1955-1976] url p. 22, p. 3, p. 36, p. 46, p. 68.
- Bulletin - New York State Museum. Albany: New York State Education Dept. url p. 287.
- Bulletin - United States National Museum. Washington: Smithsonian Institution Press, [etc.];1877-1971. url , p. 168, p. 176, p. 180, p. 181, p. 28, p. 766, p. 781.
- Bulletin / Peabody Museum of Natural History. 1955 New Haven: Peabody Museum of Natural History, url p. 299.
- Bulletin / University of Montana. Missoula: University of Montana, 1901-1910. url p. 305, p. 45.
- Bulletin / Vermont Bird Club. [Rutland, Vt.]: The Club, 1906-1914 url p. 36, p. 8.
- Bulletin of the Bird Club of Princeton University. Princeton, N.J.: The Club, 1901. url , p. 15, p. 29, p. 47.
- Bulletin of the British Museum (Natural History). London: The Museum, 1950-1977. url p. 157, p. 211.
- Bulletin of the Museum of Comparative Zoology at Harvard College. Cambridge, Mass.: The Museum, 1863- url p. 143, p. 229, p. 82, p. 82.
- Bulletin of the Southern California Academy of Sciences Los Angeles, Calif.: The Academy, 1971- url p. 11, p. 5.
- Bulletin of the United States Geological and Geographical Survey of the Territories / Department of the Interior. Washington: Government Printing Office, 1874- url p. 104.
- Bulletin. Salem, Mass. url p. 140.
- California fish and game. [San Francisco, etc.]: State of California, Resources Agency, Dept. of Fish and Game. url p. 201, p. 252, p. 287, p. 299, p. 80, p. 85.
- Catalogue of British Columbia birds. Victoria, B. C., Printed by R. Wolfenden, 1904. url , , p. 29.
- Catalogue of Canadian birds / by John Macoun and James M. Macoun. Ottawa: Canada Dept. of Mines, Geological Survey Branch, 1909. url p. 247.
- Catalogue of Canadian birds, by John Macoun. .. and James M. Macoun. .. Ottawa, Government printing bureau, 1909. url p. 247.
- Catalogue of birds of the Americas and the adjacent islands in Field Museum of Natural History. by Charles E. Hellmayr and Boardman Conover. 13 1949 Chicago: Field Museum of Natural History, 1949. url p. 61.
- Check list of New York birds, Albany, University of the State of New York, 1900. url .
- Check list of New York birds, by Marcus S. Farr. Albany: University of the State of New York, 1900. url p. 287.
- Check-list and bibliography on the occurrence of insects in birds' nests. Ames, Iowa State College Press url p. 171.
- Check-list of North American birds, New York, American Ornithologists' Union, 1895. url .
- Check-list of North American birds. [Ithaca, N.Y.]1957. url p. 104.
- Check-list of North American birds: the species of birds of North America from the Arctic through Panama, including the West Indies and Hawaiian Islands / prepared by the Committee on Classification and Nomenclature of the American Orni Lawrence, Kan.: American Ornithologists' Union, 1983. url p. 109.
- Check-list of birds of the world. Cambridge: Harvard University Press, 1931-1987. url p. 217, p. 273, p. 345.
- Checklist of CITES Species CITES, WCMC url p. 133, p. 91.
- Checklist of CITES Species: a reference to the appendices to the Convention on International Trade in Endangered Species of Wild Fauna and Flora CITES url p. 106, p. 120, p. 132, p. 51.
- Checklist of birds listed in the CITES appendices and in EC Regulation 338/97 JNCC url p. 26.
- Color key to North American birds, with bibliographical appendix, by Frank M. Chapman. .. with upwards of 800 drawings, by Chester A. Reed, B.S. New York, D. Appleton & Company, 1912. url p. 131.
- Directory of Wetlands of International Importance. IUCN url p. 114, p. 757.
- Directory to the birds of Eastern North America. .. West Newton, 1918. url p. 162.
- Effects of highways on wildlife and fish with special reference to Montana a ProCite literature collection / Bozeman, Mont.: Fish and Wildlife Management Program, Montana State University, 2001 url , .
- Eggs of native Pennsylvania birds: a world's fair collection / owned and exhibited by J. Warren Jacobs. Waynesburg, Pa.: Independent Job Department, 1895. url p. 7.
- Erigenia: journal of the Illinois Native Plant Society. Carbondale, Ill.: The Society, 1982- url p. 126.
- FWS/0BS. [Washington]Fish and Wildlife Service, U.S. Dept. of the Interior. url p. 141, p. 21, p. 442.
- Fanciers' journal and land & water. Hartford [Conn.]: Joseph M. Wade,  url p. 79.
- Fauna of New England, 11: list of the aves / by Glover M. Allen. Boston: Society of Natural History, 1909. url p. 98.
- Fauna of New England. List of the Araneida. Boston, For Society, 1908. url .
- Fauna of New England. by Glover M. Allen. Boston: Society of Natural History, 1909. url p. 98.
- Final environmental impact statement: proposed estuarine sanctuary grant award to the state of New York for a Hudson River estuarine sanctuary / Albany, N.Y.: The Department,  url p. 52, p. 55.
- Great Basin naturalist memoirs. 1976 [Provo, Utah]Brigham Young University, 1976-1992. url p. 212, p. 62, p. 77.
- Handbook of birds of the western United States: including the Great Plains, Great Basin, Pacific Slope, and lower Rio Grande Valley / by Florence Merriam Bailey. Boston: Houghton Mifflin, 1915, c1902. url p. 152.
- Illinois River Bluffs area assessment / Illinois Department of Natural Resources, Office of Scientific Research and Analysis, [and the] State Geological Survey Division. Springfield, Ill.: Illinois Dept. of Natural Resources, 1998- url p. 72.
- Illustrations of the birds of California, Texas, Oregon, British and Russian America.: Intended to contain descriptions and figures of all North American birds not given by former American authors, and a general synopsis of North American ornithology. / By John Cassin, member of the Academy of Natural Sciences of Philadelphia; of the American Philosophical Society; of the Horticultural Society of Pennsylvania; of the National Institute; of the South 1862 Philadelphia:: J.B. Lippincott & Co., 1862. url p. 117.
- In the Acadian land nature studies / by Robert R. McLeod. Boston: B. Whidden, 1899. url .
- In the Acadian land; nature studies, by Robert R. McLeod. Boston: B. Whidden, 1899. url p. 133.
- Journal of ethnobiology. 12-13 1992-1993 Flagstaff, Ariz.: Center for Western Studies, 1981- url p. 93.
- Journal of the Kentucky Academy of Science. Lexington, KY: The Academy, 1998- url p. 170, p. 185.
- Life and sport on the north shore of the lower St. Lawrence and Gulf, containing chapters on salmon fishing, trapping, the folk-lore of the Montagnais Indians and tales of adventure on the fringe of the Labrador peninsula. By Napoleon A. Comeau. Quebec, Daily Telegraph Printing House, 1909. url p. 434.
- Life-histories of the birds of eastern Pennsylvania, by Thomas G. Gentry. .. Philadelphia: Pub. by the author, 1876-77. url p. 233.
- List of birds found in West Virginia. Charleston, Tribune Printing Co., 1909. url p. 19.
- List of birds of Dover / by Albert Pitts Morse. S.l.: s.n., 1897? url p. 5.
- Management plan, Robb/Ledford wildlife management area. [Helena]:Montana Fish, Wildlife & Parks,  url .
- Memoirs of the Nuttall Ornithological Club. Cambridge, Mass.: The Club, 1886- url p. 184, p. 207.
- Memoirs of the San Diego Society of Natural History. 13 1984 San Diego, Calif.: The Society, 1931-1989. url p. 246, p. 267, p. 45, maps 7-8, page 46, p. xv.
- Miscellaneous publication - University of Kansas, Museum of Natural History. 1965 Lawrence: University of Kansas, 1946-1996. url p. 16, p. 16, p. 50, p. 51.
- North American birds eggs. New York: Dover Pub, . url p. 157.
- North American fauna. Washington: Fish and Wildlife Service; for sale by the Supt. of Docs., U. S. Govt. Print. Off. url p. 29, p. 391, p. 391, p. 54.
- North American oölogy. By Thomas M. Brewer. Part I.--Raptores and Fissirostres. Washington, Smithsonian institution, 1857 url , p. 119, p. 20.
- Occasional papers - San Diego Society of Natural History. 1959 San Diego, The Society. url p. 11.
- P.D. Skaar's Montana bird distribution / revised by the Montana Bird Distribution Committee. [Helena, MT]:Montana Natural Heritage Program, 1996 url p. 30.
- Pacific coast avifauna / Cooper Ornithnological Club of California. Santa Clara, Calif.: The Club, 1900-1974. url p. 16.
- Pesticides monitoring journal. [Washington, D.C.: For sale by the Supt. of Docs., U.S. G.P.O., 1967-1981. url p. 10.
- Polychlorinated biphenyl hazards to fish, wildlife, and invertebrates: a synoptic review / by Ronald Eisler (Patuxent Wildlife Research Center, U.S. Fish and Wildlife Service). Laurel, MD: The Service, 1986. url p. 15.
- Postilla. 1968 New Haven, Conn.: Peabody Museum of Natural History, [1950?]-c2004. url p. 13.
- Potential wildlife-highway interactions at select mile-markers along Montana Department of Transportation routes an ArcView GIS analysis / Bozeman, Mont.: Fish and Wildlife Management Program, Montana State University, 2001 url .
- Proceedings of the Biological Society of Washington. Washington, Biological Society of Washington url p. 193, p. 287, p. 3, p. 40, p. 43.
- Proceedings of the California Academy of Sciences, 4th series. San Francisco, California Academy of Sciences. url p. 164, p. 284, p. 292, p. 3, p. 495, p. 587, p. 625, p. 63.
- Proceedings of the Delaware County Institute of Science. Media, Pa.: The Institute, 1906- url p. 2.
- Proceedings of the Manchester Institute of Arts and Sciences. Manchester, N.H.: The Institute, 1900-1911. url p. 205, p. 97.
- Proceedings of the Nebraska Ornithologists' Union. Lincoln, [1900-15] url p. 24, p. 54, p. 71.
- Proceedings of the Rochester Academy of Science. Rochester, N.Y.: The Academy.1889- url .
- Proceedings of the United States National Museum. Washington: Smithsonian Institution Press, [etc.] url p. 181, p. 595.
- Proposed estuarine sanctuary grant award to the state of New York for a Hudson River estuarine sanctuary. Albany, N.Y.: New York, Dept. of Environmental Conservation,  url p. 121, p. 52, p. 55.
- Protozoology. Springfield, Ill., C. C. Thomas url p. 586, p. 919.
- Provincial Museum of Natural History and Enthnology. Victoria, B.C., Printed by Richard Wolfenden, 1909. url p. 43.
- Publication. Field Museum of Natural History. Chicago, U.S.A.: The Museum, 1910-1943. url , , , p. 146, p. 148, p. 457.
- Publications in zoology = Publications en zoologie. Ottawa: National Museums of Canada, National Museum of Natural Sciences, 1970-1982. url p. 13, p. 52.
- Report of the Commissioner of Agriculture. .. Washington: G.P.O., 1863-1889. url p. 290.
- Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean. Made under the direction of the secretary of war, in 1853-. .. Washington, A.O.P. Nicholson, Printer [etc.]1855-60. url p. 16.
- Robb/Ledford Wildlife management area: draft management plan. Helena, MT: Montana Fish, Wildlife & Parks, 1999 url .
- Rock River area assessment / Illinois Department of Natural Resources, Office of Scientific Research and Analysis, Natural History Survey Division, in conjunction with State Geological Survey Division. Springfield, IL: Illinois Dept. of Natural Resources, 1996- url p. 132, p. 44.
- Sex and internal secretions. Contributors: A. Albert [and others] Foreword by George W. Corner. Baltimore, Williams & Wilkins, 1961. url p. 1112.
- Smithsonian contributions to knowledge. Washington: Smithsonian Institution, 1848-1916. url , p. 119, p. 20.
- Smithsonian miscellaneous collections. 2 1862 Washington: Smithsonian Institution, 1862-1968. url p. 1, p. 34, p. 41.
- Special scientific report--wildlife / U.S. Department of the Interior, Fish and Wildlife Service. Washington, D.C.: The Service, 1949- url p. 148, p. 17, p. 23, p. 24, p. 90.
- Station bulletin. Durham, N.H.: Agricultural Experiment Station, University of New Hampshire, 1948- url p. 100.
- Summer birds of Flathead Lake / by P.M. Silloway. Missoula: University of Montana, 1901. url .
- The American Museum journal. New York: American Museum of Natural History, c1900- url p. 17.
- The Auk. Washington, D.C.: American Ornithologists' Union, etc., 1884- url p. 142, p. 151, p. 189, p. 233, p. 353, p. 37, p. 433, p. 454, p. 46, p. 72.
- The Canadian field-naturalist. 63 1949 Ottawa, Ottawa Field-Naturalists' Club. url title page, index, v.63 , , , , title page, index , , p. 10, p. 137, p. 162, p. 170, p. 194, p. 199, p. 216, p. 222, p. 222, p. 244, p. 257, p. 27, p. 270, p. 301, p. 320, p. 321, p. 339, p. 346, p. 379, p. 385, p. 385, p. 394, p. 415, p. 421, p. 458, p. 474, p. 479, p. 52, p. 55, p. 555, p. 557, p. 565, p. 569, p. 580, p. 583, p. 584, p. 61, p. 618, p. 685, p. 697, p. 701, p. 703, p. 716, p. 734, p. 758, p. 9.
- The Great Basin naturalist. 39 1979 Provo, Utah: M.L. Bean Life Science Museum, Brigham Young University, 1939-1999. url p. 157, p. 166, p. 174, p. 248, p. 281, p. 315, fig. 1, page 369, p. 479, p. 499, p. 516, p. 520, p. 596, p. 650, p. 652, p. 720, p. 730.
- The Nidologist. New York City: Henry Reed Taylor, [1895-1897] url p. 129.
- The University of Colorado studies. Boulder, University of Colorado. url p. 229, p. 235.
- The University of Kansas science bulletin. 42 1961 [Lawrence]: University of Kansas, 1902-1996. url p. 100.
- The Wilson bulletin. Columbus, Ohio: Wilson Ornithological Society, 1894- url p. 3, p. 35, p. 38, p. 52, p. 6, p. 83.
- The birds of Albany County; a catalogue of the species recorded in this vicinity with notes on their lives and habits, and brief field-marks for aid in identification. Containing one plate from a water-color by William S. Barkentin; ten plates from pen and ink drawings by George Louis Richard, and eleven half-tones from photographs. Albany, N. Y.[Press of Brandow printing co.]1907. url p. 133.
- The birds of Erie and Presque Isle, Erie County, Pennsylvania / Pittsburgh?: s.l., 1904? url , .
- The birds of Essex County, Massachusetts. By Charles Wendell Townsend, M.D. Cambridge, Mass.: The Club, 1905. url p. 207.
- The birds of Fergus County, Montana / by P. M. Silloway. Lewistown, Mont.: Press of the Argus, 1903. url p. 28.
- The birds of Illinois and Wisconsin / by Charles B. Cory. Chicago: Field Museum of Natural History, 1909. url p. 148, p. 457, p. 735, p. 751.
- The birds of Indiana. A descriptive catalogue of the birds that have been observed within the state, with an account of their habits. Indianapolis, Indiana Dept. of Geology and Natural Resources, 1898 url p. 777.
- The birds of Indiana; a descriptive catalog of the birds that have been observed within the state, with an account of their habits. Indianapolis, W. B. Burford, Contractor for State Printing, 1898 url .
- The birds of Maine; with key to and description of the various species known to occur or to have occured in the state, an account of their distribution and migration, showing their relative abundance in the various count by Ora Willis Knight. .. Bangor, Me.[printed by C. H. Glass & co.]1908. url p. 223.
- The birds of Massachusetts, Cambridge, Mass., 1901. url .
- The birds of Massachusetts, by Reginald Heber Howe and Glover Morrill Allen. Cambridge, Mass., 1901. url p. 62, p. 62.
- The birds of North America: one hundred and nineteen artistic colored plates representing the different species and varieties drawn and colored from nature: including a copious text giving a popular account of their habits and 1903 New York: Published under the auspices of the Natural Science Association of America, 1903. url p. 167.
- The birds of Ohio; a complete scientific and popular description of the 320 species of birds found in the state, Columbus, The Wheaton Publishing Co., 1903, [c1902] url , , .
- The birds of Ohio; a revised catalogue, by Lynds Jones. [Columbus?]Academy of science, 1903. url p. 90.
- The birds of Rhode Island / by Reginald Heber Howe, and Edward Sturtevant. [S.l.: s.n.], 1899. url p. 13, p. 57.
- The birds of Rhode Island n. p.c1899 url , .
- The birds of Rhode Island. [n. p.]1899. url p. 13, p. 57.
- The birds of Springfield and vicinity / Springfield, Mass.: Henry R. Johnson, l901. url .
- The birds of Texas; an annotated check list, Waco, Tex., The University, 1912. url .
- The birds of Washington: a complete, scientific and popular account of the 372 species of birds found in the state / by William Leon Dawson, assisted by John Hooper Bowles. Illustrated by more than 300 original half-tones of birds in life, nests, eggs, and favorite haunts, from photographs by the author and others, Seattle: Occidental Pub. Co., 1909. url p. 499.
- The birds of Washington; a complete, scientific and popular account of the 372 species of birds found in the state, by William Leon Dawson, assisted by John Hooper Bowles. Illustrated by more than 300 original half-tones of birds in life, nests, eggs, and favorite haunts, from photographs by the author and others, Seattle: The Occidental Pub. Co., 1909. url p. 499.
- The birds of Wyoming / By Wilbur C. Knight. Laramie, Wyo.: Wyoming Experiment Station, 1902. url p. 115.
- The birds of Wyoming. [Laramie, Wyoming Experiment Station]1902. url .
- The birds of the Cambridge region of Massachusetts. Cambridge, Mass., The Club, 1906. url .
- The birds of the Chicago area / [Chicago, Jennings and Graham], 1907. url .
- The birds of the Chicago area, by Frank Morley Woodruff. .. [Chicago, Printed by Jennings and Graham]1907. url p. 93.
- The condor. Santa Clara, Calif.: Cooper Ornithological Club, [1900- url p. 147.
- The land-birds and game-birds of New England with descriptions of the birds, their nests and eggs, their habits and notes. Boston, Houghton, Mifflin, 1903. url .
- Transactions of the Canadian Institute. Toronto: Canadian Institute. url p. 91.
- Transactions of the Kentucky Academy of Science. [Lexington, Ky.]Kentucky Academy of Science, 1923-1997. url p. 145, p. 166, p. 81, p. 95.
- Transactions of the San Diego Society of Natural History. 14 1967 [San Diego]: The Society, 1905-1989. url p. 213, p. 242, p. 391, p. 42.
- Travels and traditions of waterfowl. Minneapolis, University of Minnesota Press url p. 286.
- University of Kansas publications, Museum of Natural History. 11 1958 Lawrence, University of Kansas. url p. 178, p. 198, p. 318, p. 457, p. 579, p. 587, p. 597, p. 607, p. 611.
- Useful birds and their protection / by Edward Howe Forbush; ill. by the author. .. and others. [Massachusetts]: published under direction of The Massachusetts State Board of Agriculture, 1908. url p. 366.
- Useful birds and their protection. Containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds. [Boston, Mass.]1907. url , .
- Useful birds and their protection: containing brief descriptions of the more common and useful species of Massachusetts, with accounts of their food habits, and a chapter on the means of attracting and protecting birds / by Edward Howe Forbush; illustrated by the author, C. Allan Lyford, Chester A. Reed, and others. Boston: Published under direction of the Massachusetts State Board of Agriculture, by authority of the Legislature, . url p. 366.
- Washington State Coastal Zone Management Program amendment no. 3: approval of the Grays Harbor estuary management plan: program draft environmental impact statement. [Olympia, Wash.?]: Grays Harbor Regional Planning Commission; 1983. url p. 4.
- World Checklist of Threatened Birds Joint Nature Conservation Committee url p. 25.
- Yearbook of agriculture. WashingtonU.S. Govt. Print. Off. url p. 670.
- [Collected reprints, 1902-1928. s.l., s.n.19--] url , .
- BirdLife International 2009. Accipiter cooperii. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloadedon 29January2012.
- Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed January 9, 2012.
- IUCN 2012. IUCN Red List of Threatened Species. Version 2011.2. . Downloaded on January 28, 2012.
Accessed through GBIF Data Portal November 27, 2007:
- Avian Knowledge Network, eBird
- Biologiezentrum der Oberoesterreichischen Landesmuseen, Biologiezentrum Linz
- Canadian Biodiversity Information Facility, Ontario Nest Records
- Canadian Biodiversity Information Facility, Provincial Museum of Alberta, Edmonton, AB, Canada. Birds
- Canadian Biodiversity Information Facility, Royal British Columbia Museum
- Museum of Vertebrate Zoology, Terrestrial vertebrate specimens
- New Brunswick Museum, NBM birds
- Santa Barbara Museum of Natural History, Santa Barbara Musem of Natural History
- UNIBIO, IBUNAM, CNAV/Coleccion Nacional de Aves
- University of Michigan Museum of Zoology
- , Bird specimens
- Biodiversity Heritage Library NamebankID: 8571
- Catalogue of Life Accepted Name Code: ITS-175309
- Global Biodiversity Information Facility Taxonkey: 1920621
- Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 175309
- IUCN ID: 188299
- Natural Heritage Network Species Identifier: ABNKC12040
- Zipcode Zoo Species Identifier: 241