North American Birds

VOLUME 69 No1 2016

A Quarterly Journal of Ornithological Record Published by the American Birding Association. The mission of the journal is to provide a complete overview of the changing panorama of our continent’s birdlife.

Issue link: http://nab.aba.org/i/629070

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N O R T H A M E R I C A N B I R D S 124 C O LO R A D O & W YO M I N G some 24, 26 Aug–2 Oct) visited Grand Junction 29 Sep–2 Oct (A. Carver), where it provided a rare and record-late West Slope report. Both of Wyoming's Northern Waterthrushes were of singles at Hereford 23 Aug (SB, LM, DE) and 13 Sep (LM, CP, DE), while the Colorado season was fairly typical (14 Aug–22 Sep), except for an in - dividual a half-month late 15 Oct at Lamar (D. Russell). Less common in fall but expected an - nually, Wyoming had a Black-and-white Warbler at Rawhide Wildlife Habitat Management Area, Goshen 29 Aug (ph. ZH) and a late bird at Casper 30 Sep (CMn). Single Prothonotary Warblers were noted 10 Sep in the mountains, where very rare, at Estes Park, Larimer (J. Nelson) and near Pueblo Reservoir (GW), where much more ex - pected. A Prothonotary Warbler at Casper 21-25 Sep (CMn, B. Walgren, ph. ZH) was Wyoming's eighth overall, seventh from fall. Five Wyoming Tennessee Warblers 6-30 Sep were noted in Laramie, Albany, and Natrona. Single Orange- crowned Warblers were late 8 Nov in s. Jefferson (DSu) and 14 Nov at Grand Junction (D. Price). Five reports of 8 Nashville Warblers 14 Aug–28 Sep, with as many as 3 at Fontenelle 1-2 Sep (DJ), made for a strong Wyoming showing, add - ing to about 17 previous fall reports. Highlights of Colorado's Nashville Warbler fight (3 Aug–23 Oct) were the 3 at Barr 20 Aug (DD) and a late bird 23 Oct in El Paso (M. Wolf). With few fall Wyoming reports, Virginia's Warblers showed strongly, with 7 singles reported from four lo - cations in three counties spanning 27 Aug–18 Sep. The season's only Mourning Warbler was at Neenoshe Reservoir 8 Sep (†SGM). A Hooded Warbler at E.K.W. 27 Aug (CMn) was Wyoming's twenty-seventh overall, ffth in fall, while Colorado's only report came from Brett Gray 21 Sep (MP). American Redstarts pushed through Wyoming 16 Aug–13 Sep, with about 15 reports involving 24 birds from seven coun - ties (m.ob.). An additional report of an imm. male from E.K.W. 30 Sep (CMn) was a day short of tying Wyoming's late date. Wyoming's sixth and seventh fall Northern Parulas, both imms., graced E.K.W. 12 Sep (CMn) and Hereford 1 Nov (ph. S. Campagnaro), the latter being record late for Wyoming by 14 days. Wyoming's ninth fall Magnolia Warbler and eighth fall Chestnut-sided Warbler were both at E.K.W. 27 Sep (ph. ZH) and 21 Aug (ZH), respectively. The Region's only Bay-breasted Warbler visited Barr 10 Oct (GW, L. Kilpatrick). Colorado had 3 Blackburnian Warblers (31 Aug–13 Sep) and 3 Chestnut-sided Warblers (21 Sep–1 Oct), with the last of the lat - ter being a male 28 Sep–1 Oct at Craig, Moffat (FL) on the West Slope, where rare; Wyoming missed these species. The last Yellow Warbler was late 6 Oct at Barr (SGM). Wyoming's only Blackpoll Warbler this season visited Cheyenne 21-23 Sep (CSe); fall accounts for less than migrant over Laramie 21 Aug (SB), and 6 noted in four Colorado counties 1 Aug–12 Sep made for a fairly typical fall showing. The Northern/ Eastern group of Hermit Thrush subspecies is apparently rare in the Region, with the individ - ual at Brett Gray 19 Oct (MP) providing just the third Regional and Colorado report. The only Wood Thrush of the season was a window kill in s. Prowers 27 Sep (JS). Gray Catbirds were quite late in Nov (noted last 14 Nov) in three e. Colorado counties, while Brown Thrashers were even more so at Prewitt Reservoir, Logan with 2 on 11 Nov and one on 29 Nov (DD). The 22 Sage Thrashers near Apishapa S.W.A., Las Animas 8 Oct were late, particularly for so many, but were eclipsed by the 23 there 15 days later (GW); while the species winters in tiny numbers in se. Colorado, such numbers would be unprecedented at that season. Single late American Pipits at Lake Hattie 4 Nov (VS) and Alcova Dam, Natrona 17 Nov (RW) added to very few Wyoming Nov reports. As many as 6 Sprague's Pipits were noted 27 Sep–25 Oct near Hale, Yuma, the one Colorado locality at which the species is regularly found (in fall). LONGSPURS THROUGH WARBLERS Although expected after mid-Oct upon the e. plains of Wyoming, Lapland Longspurs are sur - prisingly infrequently reported, and this fall's sole report was of a single on 33-Mile Rd., Natrona 11 Nov (CMn). Conversely, 2 at Behrens Reservoir 28 Sep (SGM) were two weeks early, while the 6000+ Laplands near Sheridan Lake, Kiowa 23 Nov (JBa, CLW) likely provided a new Colorado maximum. Rare away from the ne. quarter of the state, Wyoming's only Snow Bunting report of 6 birds came from Atlantic City, Fremont 20 Nov (DN), while Colorado's only fall report, a single 22 Nov over Tamarack Ranch (DD), came from the only part of the state where regular. The cryptic tendencies of Wyoming's fall migrant Ovenbirds were refected in the fact that a single at Rawhide Wildlife Habitat Management Area, Goshen 26 Aug (DJ) was the frst fall report for the state. The latest Colorado migrant Ovenbird (of than 7 Sep were three reports involving 5 lin- gering Bank Swallows 12-17 Sep (m.ob.), while the latest in Colorado was in sw. Weld 28 Sep (SGM). Late was a Barn Swallow in Jefferson 27 Oct (DSu). Amazingly late, particularly for so many, were the 30 Cliff Swallows 28 Sep in Washington (B. Snyder). The most far-fung of a minor Mountain Chickadee movement onto the Plains, one was at Tamarack Ranch S.W.A., Logan and 2 at Ovid, Sedgwick 22 Nov (DD). A Juniper Titmouse was well n. of normal in a Jefferson yard 12 Oct+ (NL). Although Pygmy Nuthatches are considered very rare in the Wyoming Black Hills, up to 5 continued at a residence on the Hills' w. fank, Crook 18 Oct+ (K. Countryman), while 7 were reported from Devil's Monument, Crook 21 Aug (W. Schackwitz), adding to about six prior eBird reports from this location. The 60 Pygmy Nuthatches at the Ponderosa Preserve, Arapahoe 18 Oct (GR) was a sizable number, especially for an isolated patch of Ponderosa Pine forest in a county dominated by urban humanity, agricul - ture, and shortgrass prairie. A House Wren at Story, Sheridan 19 Oct (CMr) was record late for Wyoming by 10 days, while a Marsh Wren was late at Hutton Lake 2 Nov (CP) and added to nine previous Nov reports for the state. At least 24 Winter Wrens (18 Oct+) were scattered in 11 e. counties, with 3 each at Brett Gray 19 Oct (MP), Two Buttes S.W.A., Baca 4 Nov (SGM), and Prewitt Reservoir, Logan 11 Nov (DD), while sin - gle Winter/Pacifc Wrens were noted in Boulder 6 Oct (SSe) and Summit 19 Oct (K. Ecton). The fourth reported in Colorado, an Eastern Marsh Wren was at Stalker Lake, Yuma 15 Oct (SGM, NM). The only Eastern Blue-gray Gnatcatcher reported this season was far w. at Crow Valley 23 Sep (SGM). A late Ruby-crowned Kinglet at Laramie 14 Nov (VS) added to just a handful of Wyoming Nov reports. An Eastern Bluebird at Laramie 16 Nov (T. Banks) provided a rare Nov Wyoming report. Despite being a widespread, though very local, breeder in the Region, Veery is rarely found as a fall migrant here, so one in n. Yellowstone, Park 6 Aug (S. Jolly), a nocturnal SA The average shape of the fall Red-breasted Nuthatch fight in Colorado is a fairly steep rise in frequency from the summer doldrums value of about 4% of eBird checklists reporting the species (through 2013) to 5% by the last week of Jul, >7% by mid-Aug, peak - ing during the second week of Sep at nearly 10%, and dropping through 8% by the second week of Oct to a rough winter baseline value of about 5.5% (with the obvious C.B.C. peak excluded) by late Oct and with average counts not varying appreciably from about 2.2 per checklist through the period, though with a spike to 3.5 in the last week of Jul. The 2014 fight was odd in that the frst pulse of migrants/wanderers pushed the fre - quency to 12% in the second week of Jul, to 28% in the third week of Aug, and maintained a frequency of about 36% from the second week of Sep through the frst week of Nov, but with average counts staying, for the most part, below 2.0 per checklist. So it was a wide - spread but thin fight this season.

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