Status: Common regular spring and fall migrant east and central, uncommon west. Common regular breeder east and east-central, uncommon west-central, rare casual west. Rare casual winter visitor south.
Documentation: Specimen: UNSM ZM7452, Apr 1888 Peru, Nemaha Co.
Taxonomy: Two subspecies are recognized (Pyle 1997): arenacea, breeding from Montana to North Dakota south to southeast Colorado and Oklahoma, wintering to south Texas and Mississippi, and pusilla, breeding from Minnesota to Maine and south to east Texas and Florida.
Carey et al (2008) treated the species as monotypic based on a cline of grayish plumage decreasing from west to east, with only birds at each end of the cline diagnosable. This cline is indeed discernible in Nebraska specimens; three specimens at UNSM from northern and western Nebraska are bland-faced with unmarked breast and flanks, while those from eastern and south-central Nebraska are darker. These darker birds, breeding in southeast South Dakota and Nebraska have been described as perissura but were considered to be only clinally different from pusilla (Pyle 1997).
Bruner et al (1904) assigned breeding birds in western Nebraska, the Niobrara River Valley, and the Loup drainage south to Broken Bow to arenacea, with pusilla breeding in the lower Missouri Valley, its northern limits uncertain; Bruner et al (1904) suggested there may be no “pure” pusilla breeding in Nebraska. It is likely that Nebraska breeding birds exhibit a clinal change from darker birds in the east to grayer birds in the west, as observed in extant museum specimens and proposed by Carey et al (2008).
Spring: Mar 19, 20, 20<<<>>> summer; Apr 15, 17, 20 <<<>>> Jun 1, 2, 4 (west)
Migration begins in late Mar or early Apr; reports in the period 24 Feb-20 Mar, if correctly identified, may be early migrants, as there are no winter records after 15 Feb. Earlier dates are of 1-2 at Chalco Hills RA, Sarpy Co 10-18 Mar 2012, and one at Pawnee Lake, Lancaster Co 17 Mar 2016. Early for the location were one in western Lincoln Co 6 Apr 2004 and another there 11 Apr 2017. The completion of migration by late May is discernible in the west, where summer residents are rare.
In the Panhandle, where the species is an uncommon migrant, there were only about 20 reports prior to 2015, when there were four more: one near Oshkosh, Garden Co 26 Apr, two at Ash Hollow SHP, Garden Co 16 May, four in Scotts Bluff Co 11 May, and one in Sioux Co 14 May. Migrants in the Panhandle are mostly if not all gray-faced birds sometimes referred to subspecies arenacea; singles identified as such were in Cheyenne Co 8 May 1998 and at Wind Springs Ranch, Sioux Co, 2 and 9 May 2001. A gray-faced bird was in McCook, Red Willow Co 25 Apr 2009.
- High counts: 133 in Hall Co 11 May 2002, 86 there 13 May 2006, and 72 in Pierce Co 10 May 1997.
Summer: Field Sparrow breeds throughout the eastern two-thirds of the state, but it is rare and local or absent in the Panhandle, areas of the southwest (Mollhoff 2016, Sauer et al 2017), and Rainwater Basin (Jorgensen 2012, Mollhoff 2016). BBS data 1966-2015 show statewide numbers are increasing 2.05% (95% C.I.; 1.01, 3.19) annually; these increases have occurred mostly in central Nebraska (Sauer et al 2017).
In the Panhandle, the only documented breeding record is of a nest with young in northern Sioux Co 21 Jun 2006 (Mollhoff 2006, 2016); two birds were reported at this location 8 Jul 2011. Breeding season reports in the Panhandle include Kimball and southeastern Garden Cos (Mollhoff 2016), a territorial bird in limber pines in southwestern Kimball Co 24 Jun 1995, 30 Jun 1966 Dawes Co, a male in summer 1992 in Sioux Co (Grzybowski 1992), one in West Ash Canyon, Dawes Co, 7 Jul 2007, and one near Lakeside, Sheridan Co 22 Jul 2017.
Brogie and Mossman (1983) found it breeding commonly west along the Niobrara River Valley to eastern Cherry Co in 1982, and recent reports extend the range west along the Valley to the NNF McKelvie area in Cherry Co (eBird.org, accessed October 2017).
Farthest west of recent reports along the Middle Loup and Dismal River Valleys are in Hooker Co 5 Jul 2011 and 28 Jul 2010 although singing males had been reported in Grant Co in 1984, a “new Sandhills locality” (Williams 1984).
In the Platte River Valley, it breeds commonly west to Keith Co, where it is a local summer resident (Rosche 1994; Brown and Brown 2001). There are no summer records west of Keith Co in the North Platte River Valley, but it is common in the South Platte River Valley. It is numerous in Lincoln Co also, where a BBS route in southeast Lincoln Co found it in 2004 on “most stops”.
Field Sparrows occupy nearly the entire area south of the Platte River Valley, with the exceptions of plains in Perkins, western Chase and northeastern Dundy Counties. Field Sparrows do occupy the entire Republican River Valley west to Colorado. Numbers are high in southwestern Nebraska where it is present, including 250 in southeast Lincoln Co 5 Jul 1995 and 175 in Frontier Co 5 Jul 1995.
- Breeding phenology:
Nest-building: 28 Apr-11 Jun
Eggs: 23 May- 23 Jul
Nestlings: 25 May-21 Jun
Fledglings: 25 May-4 Jul
Fall: Aug 15,17,20 <<<>>> Nov 22,24,25
Migration is generally completed by mid-Nov, with a later date 27 Nov 2010 in Hitchcock Co. Dec and later reports are discussed below (see Winter).
Until 2000 there were fewer than 30 fall reports from the Panhandle in the period 21 Aug-4 Oct; however, in recent years reports have increased, possibly due to the generally increasing numbers of Field Sparrows in the state (see Summer). Many, if not most, reports in the west are of gray-faced birds; one was banded and photographed at Chadron SP, Dawes Co 18 Sep 2014, two were in Dundy Co 22 Sep 2012, and one was at North Platte SL, Lincoln Co 28 Sep 2012.
- High counts: 100 at Rowe Sanctuary, Buffalo Co 13 Oct 1996, 69 in Garfield Co 2 Oct 2016, and 40 at Wehrspann Lake, Sarpy Co 16 Oct 2009.
Winter: Field Sparrows winter north to the southern border of Nebraska in small numbers, most often as single birds or very small groups with American Tree Sparrows. Details of identification should accompany such reports as wintering Field Sparrows can be confused with immature White-crowned Sparrows or American Tree Sparrows.
Many winter reports are in Dec and are likely a function of lingering fall migrants and increased detection due to CBCs. Reports away from the south-central and southeast include two on the Scottsbluff CBC 14 Dec 1974, one in southeast Garden Co 18 Dec 1982 (Rosche 1994), and singles on the Lake McConaughy CBC 29 Dec 2007 and 27 Dec 2014. Northerly were two on the Norfolk CBC 21 Dec 1985.
The only report of overwintering is of one in Aurora, Hamilton Co 1951-52 (Swanson 1953). There are reports into Jan, but these decline rapidly after mid-Jan, with these few: 11 Jan 1986 Antelope Co (Cortelyou 1986), 18 Jan 2012 Seward Co, 19 Jan 2018 Sarpy Co, 20 Jan 1990 Polk Co, 22 Jan 2009 Cass Co, 25 Jan 2006 Lincoln Co, 27 Jan 1983 Douglas-Sarpy Cos, 29 Jan 1954 Lancaster Co, 5 Feb 1966 Adams Co, 7 Feb 2011 Broken Bow, Custer Co, 11 Feb 1979 Boone Co, 12 Feb 1969 Platte Co, 12 Feb 2014 North Platte, Lincoln Co, and 15 Feb 2013 Saunders Co.
BBS: Breeding Bird Survey
CBC: Christmas Bird Count
NNF: Nebraska National Forest
RA: Recreation Area
SHP: State Historical Park
SL: Sewage Lagoons
SP: State Park
UNSM: University of Nebraska State Museum
Brogie, M.A., and M.J. Mossman. 1983. Spring and summer birds of the Niobrara Valley Preserve, Nebraska: An annotated checklist. NBR 51: 44-51.
Brown, C.R., and M.B. Brown. 2001. Birds of the Cedar Point Biological Station. Occasional Papers of the Cedar Point Biological Station, No. 1.
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.
Carey, M., D.E. Burhans, and D.A. Nelson. 2008. Field Sparrow (Spizella pusilla), version 2.0. In The Birds of North America (A. F. Poole, Editor). Cornell Lab of Ornithology, Ithaca, New York, USA. https://doi.org/10.2173/bna.103.
Cortelyou, R.G. 1986. 1986 (Sixty-first) Spring Occurrence Report. NBR 54: 46-64.
Grzybowski, J.A. 1992. Southern Great Plains Region. American Birds 46: 1151-1152.
Jorgensen, J.G. 2012. Birds of the Rainwater Basin, Nebraska. Nebraska Game and Parks Commission, Lincoln, Nebraska, USA.
Mollhoff, W.J. 2006. The 2006 Nebraska nest report. NBR 74: 142-147.
Mollhoff, W.J. 2016. The Second Nebraska Breeding Bird Atlas. Bull. Univ. Nebraska State Museum Vol 29. University of Nebraska State Museum, Lincoln, Nebraska, USA.
Pyle, P. 1997. Identification Guide to North American Birds. Part I, Columbidae to Ploceidae. Slate Creek Press, Bolinas, California, USA.
Rosche, R.C. 1994. Birds of the Lake McConaughy area and the North Platte River valley, Nebraska. Published by the author, Chadron, Nebraska, 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.
Swanson, K.S. 1953. Field Sparrow winters at Aurora. NBR 21: 9.
Williams, F. 1984. Southern Great Plains Region. American Birds 38: 1035-1037.
Silcock, W.R., and J.G. Jorgensen. 2018. Field Sparrow (Spizella pusilla), Version 1.0. In Birds of Nebraska — Online. www.BirdsofNebraska.org