AMERICAN CROW

Corvus brachyrhynchos brachyrhynchos, C. b. hesperis

Status:  Common regular resident statewide. Abundant regular spring and fall migrant statewide. Abundant regular winter visitor statewide.

Documentation:  Specimen: UNSM ZM7635, 18 May 1907 Cass Co.

Taxonomy:  Four subspecies are recognized (Pyle 1997, Gill and Donsker 2017, Clements et al 2016): hesperis from northern British Columbia to southern Saskatchewan south to southern California and east to southern Nevada and east-central Kansas, hargravei  in the Rocky Mountains from southern Idaho to central  Arizona and eastern New Mexico, brachyrhynchos from northwest Canada to Newfoundland south to south Texas and New Jersey, and pascuus of central and south Florida.

According to Phillips (1986), the western subspecies hesperis breeds in most of Nebraska west of the eastern woodlands and eastern brachyrhynchos breeds in the wooded east, presumably the Missouri River Valley. The Rocky Mountain subspecies hargravei may breed in the northwest (John Hubbard, personal communication).

Resident: Many crows breeding in Nebraska are probably resident; banding data cited by Verbeek and Caffrey (2002) suggested that half of crows banded in winter between 38 and 42 degrees latitude (Nebraska lies between 40 and 43 degrees) in the eastern USA were resident, but even in southern and central Illinois, many breeders migrate.

Spring: Crows of the Great Plains exhibit marked migratory tendencies (Bent 1946); birds from the northern parts of the breeding range leave in winter, generally southward.  Migration is marked by movements of flocks; peak migration in Nebraska is during Mar, although the 1274 at Brady, Lincoln Co 13 Feb 2010 were probably early migrants.

Banding studies of birds wintering in Oklahoma showed that most of these birds summered in the prairie provinces of Canada; birds banded in Alberta, Saskatchewan, and Manitoba migrated southeastward through eastern Montana, North Dakota, and western Wisconsin as far as Oklahoma and eastern Texas (Verbeek and Caffrey 2002).

  • High counts:  2490 in northeast Nebraska (2000+ in one flock near Redbird WMA, Holt Co) 23 Mar 2003, 600-800 in Jefferson Co 6 Mar 2005, 480 in the eastern Rainwater Basin 20 Mar 2005, and 405 in Lincoln Co 11 Mar 2015.

Summer: BBS data (Cortelyou 1978, Sauer et al 2017) indicate that summering birds are most numerous in the east, with fewer birds distributed rather evenly over the rest of the state and absence in the extreme southwest.  Around 1900 this species was rare west of the 98th meridian, but was spreading westward (Bruner et al 1904).  Tout (1902) believed that the western limit of its range was Otoe Co, and by 1938 it had spread to the Sandhills, probably due to tree planting by settlers (Viehmeyer 1938). An early southern Panhandle specimen was taken in Kimball Co 8 Jun 1919 (UNSM 7639), and Swenk noted (1906) that the species was increasing in Sioux Co and that the flock at Glen “had increased to 28” by Aug 1905. It was still rare to uncommon in the 1980s on the northeastern Colorado plains (Andrews and Righter 1992), and in Nebraska it is scarcest in the southern Panhandle and southwest. A flock of 53 was in Dundy Co 21 Jul 2000.

  • Breeding Phenology:
    Copulation: 7 Mar
    Nest Building: 20 Feb-23 Mar
    Eggs: 1-26 Apr
    Nestlings: 16 Apr
    Fledglings: 27 May-2 Jun

Cary (1900) indicated that two broods are raised in Antelope Co, 1-15 Apr and 30 May-15 Jun.

FallFamily groups begin to group together in late Jul; 13 birds were in southeast Sarpy Co 23 Jul 2008 and 42 in Lancaster Co 28 Jul 2012. Peak migration is during Oct. Large flocks such as the 400 near Chadron SP, Dawes Co 22 Oct 2000 are uncommon on the Pine Ridge (Silcock and Rosche 1994).

  • High counts:  3000 in the Rainwater Basin 28 Oct 1996, 2000 flying over in a string in Lincoln Co 7 Oct 1934 (Tout 1947), and 2000 at one playa wetland in Hayes Co 27 Oct 2005. Panhandle:  400 near Chadron SP 22 Oct 2000, 100 in southeast Garden Co 26 Nov 2016, and 86 at Chadron, Dawes Co 8 Oct 1994.

Winter: This species is most common in winter, when resident populations are presumably augmented by birds from further north.  During late fall and winter large flocks form and often roost in cities and towns throughout the state.  In the earlier part of the century these large concentrations, often numbering in the tens of thousands, were considered a nuisance in more isolated towns on the Great Plains, leading to the winter practice of “crow shoots,” often conducted at night at the roost site.  Roosts were present near Kearney, Buffalo Co in 1988-89 and 1989-90, when 5000 birds were counted on CBCs each year, and over 100,000 have roosted there during the winters of the mid-1990s.  A roost at Holdrege, Phelps Co for about 25 years prior to 1996 has held more than 100,000 birds. “Thousands” were present in mid-Feb 2008 in the Callaway-Merna area of Custer Co, and 5000 were estimated on the Calamus-Loup CBC 29 Dec 2013.

CBC data show fairly even distribution statewide in late Dec, but occasional roosts in the south, especially the central Platte River Valley, boost numbers there. High CBC counts were 9602 at Calamus Reservoir, Loup Co in 27 Dec 2003, 9568 there 1 Jan 2005, 5223 there 31 Dec 2012, 3000 at Kearney in 1986-87, and 2767 at Grand Island, Hall Co in 1990-91.

  • High counts: (non-CBC) 4500 at Jeffrey Res, Lincoln Co 19 Jan 2015, and 3000 in Jefferson Co 3 Jan 2004.

Abbreviations

BBS: Breeding Bird Survey
CBC: Christmas Bird Count
SP: State Park
SRA: State Recreation Area
UNSM: University of Nebraska State Museum
WMA: Wildlife Management Area (State)

Acknowledgement

Photograph (top) of an American Crow at Papillion, Sarpy Co 21 Sep 2017 by Phil Swanson.

Literature Cited

Andrews, R., and R. Righter. 1992. Colorado birds.  Denver Museum of Natural History, Denver, Colorado, USA.

Bent, A.C. 1946. Life histories of North American Jays, Crows and Titmice. Bulletin of the United States National Museum 191. Two Parts.  Dover Publications Reprint 1964, New York, New York, USA.

Bruner, L., R.H. Wolcott, and M.H. Swenk. 1904. A preliminary review of the birds of Nebraska, with synopses. Klopp and Bartlett, Omaha, Nebraska, USA.

Cary, M. 1900. Some bird notes From the Upper Elkhorn. Proceedings of Nebraska Ornithologists’ Union 1: 21-29.

Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2016. The eBird/Clements checklist of birds of the world: v2016, accessed 30 January 2018.

Cortelyou, R.G. 1978. The first eleven years of Breeding Bird Surveys in Nebraska. NBR 46: 38-62.

Gill, F., and D. Donsker (Eds). 2017. IOC World Bird List (v 7.3), accessed 30 January 2018.

Phillips, A.R. 1986. The known birds of North and Middle America. Part 1. Published by the author, Denver, Colorado, USA.

Pyle, P. 1997. Identification Guide to North American Birds. Part I, Columbidae to Ploceidae. Slate Creek Press, Bolinas, California, USA.

Sauer, J.R., D.K. Niven, J.E. Hines, D.J. Ziolkowski, Jr, K.L. Pardieck, J.E. Fallon, and W.A. Link. 2017.  The    North American Breeding Bird Survey, Results and Analysis 1966 – 2015 (Nebraska). Version 2.07. USGS Patuxent Wildlife Research Center, Laurel, Maryland, USA.

Silcock, W.R., and R.C. Rosche. 1994. Fall Field Report, August-November 1994. NBR 62: 126-149.

Swenk, M.H. 1906. Some Nebraska bird notes. Auk 23: 108-109.

Tout, W. 1902. Ten years without a gun. Proceedings of Nebraska Ornithologists’ Union 3: 42-45.

Tout, W. 1947. Lincoln County birds. Published by the author, North Platte, Nebraska, USA.

Verbeek, N.A. and C. Caffrey. 2002. American Crow (Corvus brachyrhynchos), version 2.0. In The Birds of North America (A. F. Poole and F. B. Gill, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bna.647

Viehmeyer, G. 1938. Is the prairie chicken passing? NBR 6: 25-29.

Recommended Citation

Silcock, W.R., and J.G. Jorgensen. 2018.  American Crow (Corvus brachyrhynchos), Version 1.0. In Birds of Nebraska — Online. www.BirdsofNebraska.org


Birds of Nebraska – Online