Tyrannus vociferans vociferans
Status: Fairly common regular spring and fall migrant west, rare casual central. Fairly common regular breeder west.
Documentation: Specimen: UNSM 6360, 19 Sep 1919 Glen, Sioux Co. This specimen was stated by the collectors to have been taken 9 Sep (Mickel and Dawson 1920).
Taxonomy: Two subspecies are recognized, vociferans of the western USA to central Mexico, and xenopterus, of southwest Mexico (Clements et al 2016). Nebraska birds are vociferans.
Spring: Apr 27, May 2,4 (Williams 1985) <<<>>> summer
There are only these reports away from known breeding areas: 11 May 1985 Garden Co (Rosche 1994, Williams 1985), 15 May 2006 Crescent Lake NWR, Garden Co, 24 May 2014 Ogallala, Keith Co, 2 Jun 2011 Oshkosh, Garden Co, and 18 Jun 2010 at Crescent Lake NWR 18 Jun 2010.
- High counts: 7 near Crawford, Dawes Co 18 May 2018, 6 in the Panhandle 6 May 2000, 6 in Long Canyon 15 May 2000, and 6 in Kimball Co 15 May 2006.
Summer: This species is most common in the southern Panhandle, especially the Bighorn and Pine Bluffs Escarpments and the Wildcat Hills (Rosche 1982, 1994). It is less common and more localized, but apparently slowly increasing on the Pine Ridge. Generally, it breeds above 3500 feet in elevation; a few high elevation grassland records associated with scattered rocky outcrops (3800-4500 ft) include up to five 1-5 Jun 2016 Agate Fossil Beds, Sioux Co, 21 Jul 2010 near Agate Fossil Beds and two there 23 May 2016, and 12 Jun 2008 Oglala National Grasslands, Sioux Co. At lower elevations, there is some overlap with Western Kingbird, especially where pines and riparian woodland meet.
On the Pine Ridge, breeding season records are surprisingly few, most in the area of Sioux and Dawes Cos between Sowbelly Canyon and West Ash Creek. There is a cluster of records in the area of Metcalf WMA, Sheridan Co that are probably related to the small population in neighboring Bennett, Shannon, and Jackson Cos, South Dakota (Tallman et al 2011). The easternmost Nebraska nesting record is from near Metcalf WMA 4-15 Jun 1986, when a pair was carrying nesting material (Huser 1986). Two were in the same area 12 Jun 1992, one was just north of Metcalf WMA 17 May 2011, and a pair was a few miles further south May 1986. The only record of breeding between West Ash Creek and Metcalf WMA is of two seen 27 Jul 2013 and eight, including a recently fledged juvenile with undeveloped remiges and rectrices, in Deadhorse Canyon, Dawes Co 23 Aug 2014.
This species was not recorded by Bruner et al (1904), apparently overlooked; the first indication of its presence in Nebraska was a report by Mickel and Dawson (1920) that it was “common in northwestern Nebraska in September 1919”. Subsequently it was reported in Scotts Bluff Co 27 Apr 1952, but not regularly reported until the 1970s. There are two Keith Co reports: one on 8 May 1953 (Huntley 1953), and another 3 Jul 1996 (Brown and Brown 2001).
- Breeding Phenology:
Nest Building: 17 Jun
Eggs: 9 Jun-1 Jul
Nestlings: 8 Jul
Fledglings: 19 Jul-13 Sep
- High counts: 22 in Carter Canyon, Sioux Co late Aug 2014, 19 north of Potter 13 Jun 2009, 14 in southwest Kimball Co 29 Jul 2000, and 14 in canyons south of Redington 2 Jun 2016.
Fall: Aug 15,19,21 <<<>>> Sep 25,26,27
Migrants may be numerous at times in fall (see High Counts).
The earliest Nebraska fledgling dates are in mid-Jul (see Breeding Phenology), suggesting that sightings in the last part of Jul are of wandering family groups. Two birds at Wind Springs Ranch, Sioux Co 21 Jul 2001, far from ponderosa pines, and one at Lake Ogallala, Keith Co 19 Jul 2014 may have been post-breeding wanderers.
Rosche (1982) noted that the Cassin’s Kingbird migration peak in fall is rather later than that of Eastern and Western Kingbirds; most “yellow-breasted kingbirds seen after about 10 Sep tend to be Cassin’s” (Rosche 1994). Fitting this pattern are easterly records from Clear Creek WMA, Garden Co 20 Sep 2013, near Lake McConaughy, Keith Co 25 Sep 2013, and 26 Sep 1963 Lincoln Co. Additional reports east of the Panhandle are 16 Aug 2008 western Cherry Co, 28 Aug 2016 Perkins Co, and 11 Sep 1963 Lincoln Co.
- High counts: 114 in Banner Co 24 Aug 2015, 52 in the southern Panhandle 26 Aug 2008, and 44 in Morrill Co 24 Aug 2015.
NWR: National Wildlife Refuge
UNSM: University of Nebraska State Museum
WMA: Wildlife Management Area (State)
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.
Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. The eBird/Clements checklist of birds of the world: v2016, accessed 30 January 2018.
Huntley, C.W. 1953. Cassin Kingbird at Brule. NBR 21: 37.
Huser, B.F. 1986. June notes for western Nebraska. NBR 54: 82-83.
Mickel, C.E., and R.W. Dawson. 1920. Some interesting records of Nebraska birds for the year 1919. Wilson Bulletin 32: 73-79.
Rosche, R.C. 1982. Birds of northwestern Nebraska and southwestern South Dakota, an annotated checklist. Cottonwood Press, Crawford, Nebraska, 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.
Tallman, D.A., Swanson, D.L., and J.S. Palmer. 2002. Birds of South Dakota. Midstates/Quality Quick Print, Aberdeen, South Dakota, USA.
Williams, F. 1985. Southern Great Plains Region. American Birds 39: 319-322.
Silcock, W.R., and J.G. Jorgensen. 2018. Cassin’s Kingbird (Tyrannus vociferans), Version 1.0. In Birds of Nebraska — Online. www.BirdsofNebraska.org
Birds of Nebraska – Online