Leiothlypis ruficapilla ruficapilla
Status: Common regular spring and fall migrant east, uncommon central, rare west.
Documentation: Specimen: ruficapilla, UNSM ZM6804, 4 May 1904 Falls City, Richardson Co.
Taxonomy: Two subspecies are recognized (Pyle 1997): ridgwayi, breeding from southern British Columbia to northwest Montana and south-central California, and ruficapilla, breeding from Manitoba to Newfoundland to montane Wyoming.
Only the eastern subspecies ruficapilla had been documented in Nebraska; it comprises the vast majority of Nebraska migrant Nashville Warblers. The western subspecies ridgwayi (“Calaveras Warbler”) may occur during migration, however, especially in fall. It differs in having a brighter yellow rump and breast, and a habit of pumping its tail, a habit usually not shared by ruficapilla (Dunn and Garrett 1997). Of 13 Panhandle reports of Nashville Warbler, one may be of ridgwayi: 14 Oct 2000 at Clear Creek WMA, Garden Co “extensive white underparts and constant tail pumping” (Stephen J. Dinsmore, pers. comm.). See Comments.
Spring: Apr 9,14,18 <<<>>> May 30,31, Jun 2
Migration occurs between late Apr and late May. There are later reports, one in Sowbelly Canyon, Sioux Co 4 Jun 2017, one at Wehrspann Lake, Sarpy Co 6 Jun 1998, a specimen, HMM 2601, taken at Inland 9 Jun 1917 (Swenk, Notes Before 1925), and Carriker reportedly shot a female with well-formed eggs in her ovary near Nebraska City, Otoe Co 11 Jun 1900 (Bruner et al 1904).
There are few Panhandle reports: 23-30 Apr 1972 Scotts Bluff Co, 11 May 1956 Sheridan Co, 12 May 2019 Dawqes Co, 16 May 2010 Dawes Co, 18 May 1958 Sheridan Co, 22 May 1957 Sheridan Co, 28 May 2011 Kimball City Park, Kimball, Kimball Co, 31 May 1959 Scotts Bluff Co, and 31 May 2011 Bushnell Cemetery, Kimball Co.
- High counts: 54 in Sarpy Co 13 May 1995, 12 at Hormel Park, Fremont, Dodge Co 5 May 1999, 12 at Wilderness Park, Lancaster Co 11 May 2018, and 11 there 12 May 2019.
Fall: Aug 18, 19, 19 <<<>>> Nov 1, 3, 3
Migration is from late Aug through late Oct, peaking mid-late Sep, rather late for a wood-warbler. There are earlier reports of a male 18 Jul 2010 in Cass Co and a single 10 Aug 1967 Douglas-Sarpy Cos. Later dates are 20 Nov 2018 Lancaster Co, 27 Nov 2006 in southeast Sioux Co, and an extraordinary report of up to three birds seen together in Omaha, Douglas Co 18-20 Dec 1993 (Grzybowski 1994).
There are 21 fall Panhandle reports, four likely of ridgwayi (see Comments), in the period 26 Aug-12 Oct, with a very late record 27 Nov 2006 in southeast Sioux Co.
- High counts: 60 at Fontenelle Forest, Sarpy Co 27 Sep 2008, 60 at Wyuka Cemetery, Lancaster Co 26 Sep 2017, and 50+ at Ponca SP, Dixon Co 18 Sep 2010.
Comments: There are no documented breeding records. Reports of breeding in the east (Ducey 1988) are likely in error, as suggested by Johnsgard (1980). Aughey (1878) was said to have found a young bird newly fledged on 10 Jun 1865, questioned by Sharpe (1993). Bent (1953) stated that it was “reported to breed in northeastern Nebraska but no specific records,” presumably a reference to Aughey’s list. A nesting report from Webster Co for 1961 (Wensien 1962) was probably referable to the unlisted therein Yellow Warbler.
There are about six sightings of claimed “Calaveras Warbler”, subspecies ridgwayi. More likely in the west, the following by experienced observers may have been ridgwayi: 20 Aug 2006 Keith Co, 2 Oct 1999 Oliver Reservoir, Kimball Co, 7 Oct 2003 Chadron, Dawes Co, and 14 Oct 2000 Clear Creek WMA, Garden Co. At least three sightings of a birds identified as ridgwayi were reported from Wilderness Park, Lincoln, Lancaster Co 23 Sep-3 Oct 2015 and 13 and 20 Oct 2017; video was taken along with descriptions, but the reports, based mostly on tail-wagging and plumage, were equivocal.
The status of ridgwayi in Nebraska deserves additional attention, since it is one of the taxa that breed in the Pacific Northwest and migrants of which occur east of the Rockies in fall (Townsend’s Warbler, Cassin’s Vireo, subspecies of Hermit Thrush).
HMM: Hastings Municipal Museum
SP: State Park
UNSM: University of Nebraska State Museum
WMA: Wildlife Management Area (State)
Photograph (top) of a Nashville Warbler at Fontenelle Forest, Sarpy Co 2 Oct 2008 by Phil Swanson.
Aughey, S. 1878. Notes on the nature of the food of the birds of Nebraska. 1878 Report of the United States Entomological Commission. Washington, DC: Government Printing Office.
Bent, A.C. 1953. Life histories of North American Wood Warblers. Bulletin of the United States National Museum 203. Two Parts. Dover Publications Reprint 1963, 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.
Ducey, J.E. 1988. Nebraska birds, breeding status and distribution. Simmons-Boardman Books, Omaha, Nebraska, USA.
Dunn, J.L., and K.L. Garrett. 1997. A field guide to warblers of North America. Houghton Mifflin Company, Boston, Massachusetts, USA.
Grzybowski, J.A. 1994. Southern Great Plains Region. American Birds 48: 222-223.
Johnsgard, P. A. 1980. A preliminary list of the birds of Nebraska and adjacent Great Plains states. Published by the author, University of Nebraska, Lincoln, USA.
Pyle, P. 1997. Identification Guide to North American Birds. Part I, Columbidae to Ploceidae. Slate Creek Press, Bolinas, California, USA.
Sharpe, R.S. 1993. Samuel Aughey’s list of Nebraska birds (1878): a critical evaluation. NBR 61: 3-10.
Swenk, M.H. Notes before 1925. Bird notes from A.M. Brooking of Hastings, C.A. Black of Kearney, and B.J. Olson of Kearney, based chiefly on their collections, up to January 1, 1925. Typed manuscript in the Nebraska Ornithologists’ Union Archives, University of Nebraska State Museum, Lincoln, Nebraska, USA.
Wensien, R. 1962. Nesting report, 1961. NBR 30: 24-25.
Silcock, W.R., and J.G. Jorgensen. 2018. Nashville Warbler (Oreothlypis ruficapilla), Version 1.0. In Birds of Nebraska — Online. www.BirdsofNebraska.org